Could not load source ...: Incorrect format of 'source' message..

## Issue Description ##
This was first reported [here](https://github.com/microsoft/vscode/issues/135814). I did change the paths for privacy, but I may as well unmask that at this point.

## Steps to Reproduce ##
Implement c# console app (net5). Create task `publishAll` that builds project, copies `bin/Debug/net5.0` folder to `~/cromwell/bin` and workspace folder (except for `obj`, `bin`, and `.git`) to `~/cromwell/code`. Add following to launch.json under `configurations`:

{
"name": ".NET Core Launch (remote console)",
"type": "coreclr",
"request": "launch",
"preLaunchTask": "publishAll",
"program": "~/cromwell/bin/deploy-cromwell-on-azure.dll",
"args": [],
"cwd": "~/cromwell/bin",
"stopAtEntry": false,
"console": "integratedTerminal",
"pipeTransport": {
"pipeCwd": "${workspaceFolder}",
"pipeProgram": "ssh.exe",
"pipeArgs": ["-T" ,"EntryInSSHConfig"[], "${debuggerCommand}"],
"debuggerPath": "~/vsdbg/vsdbg"
},
"sourceFileMap": {
"${workspaceFolder}": "~/cromwell/code"
},
"logging": {
"engineLogging": true
}

Set breakpoint at line 96 in Deployer.cs file, select `.NET Core Launch (remote console)` configuration, hit green triangle.

## Expected Behavior ##
debugger stops at line 96 in Deployer.cs file, vscode shows Deployer.cs file around that line, breakpoint shows red in column to left of line numbers where it was red before launching.

## Actual Behavior ##
* new tab opens in editor, showing `\remote\sources\path\Deployer.cs` in bold+italics, with content: `Could not load source \remote\sources\path\Deployer.cs: Incorrect format of 'source' message..`
* Original tab in editor does not show breakpoint as active.
* `Breakpoints` list shows that there is at least one active breakpoint in `\remote\sources\path\Deployer.cs`

Note that vscode is running in Windows, and debugger is running in Linux.

Note also that the **remote** extensions do me no good because I need my code and my debugger at different locations (the source copy to remote is a concession to the fact that the debugger simply would refuse to honor breakpoints when it can't read the source file "locally").

If it helps. I had captured the following engine logging (trimmed to what looked most pertinent):

```
-> (C) {"command":"setBreakpoints","arguments":{"source":{"name":"Deployer.cs","path":"${workspaceFolder}\Deployer.cs","checksums":[{"algorithm":"SHA1","checksum":"6df7c4f3a3bdd7b19f49ae99fb427f6984c67668"},{"algorithm":"SHA256","checksum":"a8c9a3ddb3949779c5e3b103abeee4b4f0b39223311b9b7ce9b1259b8a01dc69"},{"algorithm":"SHA1","checksum":"5f4ca8a154a8be70898341534d8e2d66653cac0c"},{"algorithm":"SHA256","checksum":"676841396975f2bcfa5d96ded90ced39685ab2aaac302427535b3d0a7d3ef139"}]},"lines":[96],"breakpoints":[{"line":96}],"sourceModified":false},"type":"request","seq":3}
<- (R) {"seq":6,"type":"response","request_seq":3,"success":true,"command":"setBreakpoints","body":{"breakpoints":[{"id":1,"verified":false,"message":"The breakpoint is pending and will be resolved when debugging starts.","line":96}]}}
...
<- (E) {"seq":20,"type":"event","event":"breakpoint","body":{"reason":"changed","breakpoint":{"id":1,"verified":true,"source":{"name":"Deployer.cs","path":"\\remote\\sources\\path\\Deployer.cs","sourceReference":0,"checksums":[{"algorithm":"SHA256","checksum":"a8c9a3ddb3949779c5e3b103abeee4b4f0b39223311b9b7ce9b1259b8a01dc69"}]},"line":96,"endLine":96,"offset":0}}}
...
<- (E) {"seq":92,"type":"event","event":"breakpoint","body":{"reason":"changed","breakpoint":{"id":1,"verified":true,"source":{"name":"Deployer.cs","path":"\\remote\\sources\\path\\Deployer.cs","sourceReference":0,"checksums":[{"algorithm":"SHA256","checksum":"a8c9a3ddb3949779c5e3b103abeee4b4f0b39223311b9b7ce9b1259b8a01dc69"}]},"line":96,"endLine":96,"instructionReference":"0x00007F2BBBDE0E7D","offset":0}}}
<- (E) {"seq":93,"type":"event","event":"stopped","body":{"reason":"breakpoint","threadId":5332,"allThreadsStopped":true,"hitBreakpointIds":[1],"source":{"name":"Deployer.cs","path":"\\remote\\sources\\path\\Deployer.cs\\Deployer.cs"},"line":96,"column":13}}-> (C) {"command":"threads","type":"request","seq":9}
<- (R) {"seq":94,"type":"response","request_seq":9,"success":true,"command":"threads","body":{"threads":[{"id":5332,"name":""}]}}
-> (C) {"command":"stackTrace","arguments":{"threadId":5332,"startFrame":0,"levels":20},"type":"request","seq":10}
-> (C) {"command":"stackTrace","arguments":{"threadId":5332,"startFrame":0,"levels":20},"type":"request","seq":11}
<- (R) {"seq":95,"type":"response","request_seq":10,"success":true,"command":"stackTrace","body":{"stackFrames":[{"id":1000,"name":"executable.dll!CromwellProjectNamespace.Deployer.DeployAsync() Line 96","source":{"name":"Deployer.cs","path":"\\remote\\sources\\path\\Deployer.cs\\Deployer.cs","sourceReference":0,"checksums":[{"algorithm":"SHA256","checksum":"a8c9a3ddb3949779c5e3b103abeee4b4f0b39223311b9b7ce9b1259b8a01dc69"}]},"line":96,"column":13,"endLine":96,"endColumn":50,"instructionPointerReference":"0x00007F2BBBDE0E7D","moduleId":1001},{"id":1001,"name":"executable.dll!CromwellProjectNamespace.Program.InitializeAndDeployAsync(string[] args) Line 37","source":{"name":"Program.cs","path":"\\remote\\sources\\path\\Program.cs","sourceReference":0,"checksums":[{"algorithm":"SHA256","checksum":"6a3707980792e6383361196e1c0bcad30b5e67456480080addf7d8d099c69ef3"}]},"line":37,"column":13,"endLine":37,"endColumn":79,"instructionPointerReference":"0x00007F2BBBDC7EA6","moduleId":1001},{"id":1002,"name":"executable.dll!CromwellProjectNamespace.Program.Main(string[] args) Line 13","source":{"name":"Program.cs","path":"\\remote\\sources\\path\\Program.cs","sourceReference":0,"checksums":[{"algorithm":"SHA256","checksum":"6a3707980792e6383361196e1c0bcad30b5e67456480080addf7d8d099c69ef3"}]},"line":13,"column":13,"endLine":13,"endColumn":50,"instructionPointerReference":"0x00007F2BBBDC6BBB","moduleId":1001},{"id":1003,"name":"[External Code]","line":0,"column":0,"presentationHint":"subtle"}],"totalFrames":4}}
<- (R) {"seq":96,"type":"response","request_seq":11,"success":true,"command":"stackTrace","body":{"stackFrames":[{"id":1000,"name":"executable.dll!CromwellProjectNamespace.Deployer.DeployAsync() Line 96","source":{"name":"Deployer.cs","path":"\\remote\\sources\\path\\Deployer.cs","sourceReference":0,"checksums":[{"algorithm":"SHA256","checksum":"a8c9a3ddb3949779c5e3b103abeee4b4f0b39223311b9b7ce9b1259b8a01dc69"}]},"line":96,"column":13,"endLine":96,"endColumn":50,"instructionPointerReference":"0x00007F2BBBDE0E7D","moduleId":1001},{"id":1001,"name":"executable.dll!CromwellProjectNamespace.Program.InitializeAndDeployAsync(string[] args) Line 37","source":{"name":"Program.cs","path":"\\remote\\sources\\path\\Program.cs","sourceReference":0,"checksums":[{"algorithm":"SHA256","checksum":"6a3707980792e6383361196e1c0bcad30b5e67456480080addf7d8d099c69ef3"}]},"line":37,"column":13,"endLine":37,"endColumn":79,"instructionPointerReference":"0x00007F2BBBDC7EA6","moduleId":1001},{"id":1002,"name":"executable.dll!CromwellProjectNamespace.Program.Main(string[] args) Line 13","source":{"name":"Program.cs","path":"\\remote\\sources\\path\\Program.cs","sourceReference":0,"checksums":[{"algorithm":"SHA256","checksum":"6a3707980792e6383361196e1c0bcad30b5e67456480080addf7d8d099c69ef3"}]},"line":13,"column":13,"endLine":13,"endColumn":50,"instructionPointerReference":"0x00007F2BBBDC6BBB","moduleId":1001},{"id":1004,"name":"[External Code]","line":0,"column":0,"presentationHint":"subtle"}],"totalFrames":4}}
-> (C) {"command":"source","arguments":{"sourceReference":0,"source":{"name":"Deployer.cs","path":"\\remote\\sources\\path\\Deployer.cs","sourceReference":0,"checksums":[{"algorithm":"SHA256","checksum":"a8c9a3ddb3949779c5e3b103abeee4b4f0b39223311b9b7ce9b1259b8a01dc69"}]}},"type":"request","seq":12}
<- (E) {"seq":97,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/vsdbg/CommandFailed","data":{"VS.Diagnostics.Debugger.vsdbg.ErrorCode":21000,"VS.Diagnostics.Debugger.vsdbg.Command":"source","VS.Diagnostics.Debugger.vsdbg.AdapterId":"coreclr","VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"20.04","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"ubuntu","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"17.0.10712.2 commit:70a83505117741ba30f92c713a4bb0d0395c3197"}}}
<- (R) {"seq":98,"type":"response","request_seq":12,"success":false,"command":"source","message":"Incorrect format of 'source' message."}

```

## Logs ##

### OmniSharp log ###

Starting OmniSharp server at 10/26/2021, 1:27:14 AM
Target: c:\Users\v-blairmurri\source\repos\CromwellOnAzure\src\deploy-cromwell-on-azure

OmniSharp server started.
Path: c:\Users\v-blairmurri\.vscode\extensions\ms-dotnettools.csharp-1.23.16\.omnisharp\1.37.16\OmniSharp.exe
PID: 3124

[info]: OmniSharp.Stdio.Host
Starting OmniSharp on Windows 6.2.9200.0 (x64)
[info]: OmniSharp.Services.DotNetCliService
Checking the 'DOTNET_ROOT' environment variable to find a .NET SDK
[info]: OmniSharp.Services.DotNetCliService
Using the 'dotnet' on the PATH.
[info]: OmniSharp.Services.DotNetCliService
DotNetPath set to dotnet
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
Located 2 MSBuild instance(s)
1: Visual Studio Community 2019 16.11.31729.503 16.11.1 - "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Current\Bin"
2: StandAlone 17.0.0 - "c:\Users\v-blairmurri\.vscode\extensions\ms-dotnettools.csharp-1.23.16\.omnisharp\1.37.16\.msbuild\Current\Bin"
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
Registered MSBuild instance: Visual Studio Community 2019 16.11.31729.503 16.11.1 - "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Current\Bin"
[info]: OmniSharp.WorkspaceInitializer
Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.CSharpFormattingWorkspaceOptionsProvider, Order: 0
[info]: OmniSharp.WorkspaceInitializer
Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.Completion.CompletionOptionsProvider, Order: 0
[info]: OmniSharp.WorkspaceInitializer
Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.RenameWorkspaceOptionsProvider, Order: 100
[info]: OmniSharp.WorkspaceInitializer
Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.ImplementTypeWorkspaceOptionsProvider, Order: 110
[info]: OmniSharp.WorkspaceInitializer
Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.BlockStructureWorkspaceOptionsProvider, Order: 140
[info]: OmniSharp.Cake.CakeProjectSystem
Detecting Cake files in 'c:\Users\v-blairmurri\source\repos\CromwellOnAzure\src\deploy-cromwell-on-azure'.
[info]: OmniSharp.Cake.CakeProjectSystem
Could not find any Cake files
[info]: OmniSharp.MSBuild.ProjectSystem
No solution files found in 'c:\Users\v-blairmurri\source\repos\CromwellOnAzure\src\deploy-cromwell-on-azure'
[info]: OmniSharp.MSBuild.ProjectManager
Queue project update for 'c:\Users\v-blairmurri\source\repos\CromwellOnAzure\src\deploy-cromwell-on-azure\deploy-cromwell-on-azure.csproj'
[info]: OmniSharp.Script.ScriptProjectSystem
Detecting CSX files in 'c:\Users\v-blairmurri\source\repos\CromwellOnAzure\src\deploy-cromwell-on-azure'.
[info]: OmniSharp.Script.ScriptProjectSystem
Could not find any CSX files
[info]: OmniSharp.WorkspaceInitializer
Configuration finished.
[info]: OmniSharp.Stdio.Host
Omnisharp server running using Stdio at location 'c:\Users\v-blairmurri\source\repos\CromwellOnAzure\src\deploy-cromwell-on-azure' on host 18472.
[info]: OmniSharp.MSBuild.ProjectManager
Loading project: c:\Users\v-blairmurri\source\repos\CromwellOnAzure\src\deploy-cromwell-on-azure\deploy-cromwell-on-azure.csproj
[info]: OmniSharp.MSBuild.ProjectManager
Successfully loaded project file 'c:\Users\v-blairmurri\source\repos\CromwellOnAzure\src\deploy-cromwell-on-azure\deploy-cromwell-on-azure.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
Adding project 'c:\Users\v-blairmurri\source\repos\CromwellOnAzure\src\deploy-cromwell-on-azure\deploy-cromwell-on-azure.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
Update project: deploy-cromwell-on-azure
[info]: OmniSharp.MSBuild.ProjectManager
Found referenced project outside root directory: c:\Users\v-blairmurri\source\repos\CromwellOnAzure\src\Common\Common.csproj
[info]: OmniSharp.MSBuild.ProjectManager
Adding project 'c:\Users\v-blairmurri\source\repos\CromwellOnAzure\src\Common\Common.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
Queue project update for 'c:\Users\v-blairmurri\source\repos\CromwellOnAzure\src\Common\Common.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
Loading project: c:\Users\v-blairmurri\source\repos\CromwellOnAzure\src\Common\Common.csproj
[info]: OmniSharp.MSBuild.ProjectManager
Successfully loaded project file 'c:\Users\v-blairmurri\source\repos\CromwellOnAzure\src\Common\Common.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
Update project: Common
[info]: OmniSharp.OmniSharpWorkspace
Adding analyzer reference: C:\Program Files\dotnet\sdk\5.0.402\Sdks\Microsoft.NET.Sdk\analyzers\Microsoft.CodeAnalysis.CSharp.NetAnalyzers.dll
[info]: OmniSharp.OmniSharpWorkspace
Adding analyzer reference: C:\Program Files\dotnet\sdk\5.0.402\Sdks\Microsoft.NET.Sdk\analyzers\Microsoft.CodeAnalysis.NetAnalyzers.dll
Received response for /quickinfo but could not find request.

### C# log ###

## Environment information ##

**VSCode version**: 1.61.2
**C# Extension**: 1.23.16

Dotnet Information
.NET SDK (reflecting any global.json):
Version: 5.0.402
Commit: e9d3381880

Runtime Environment:
OS Name: Windows
OS Version: 10.0.22000
OS Platform: Windows
RID: win10-x64
Base Path: C:\Program Files\dotnet\sdk\5.0.402\

Host (useful for support):
Version: 5.0.11
Commit: f431858f8b

.NET SDKs installed:
5.0.402 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 3.1.20 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 3.1.20 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.11 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 3.1.20 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 5.0.11 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

To install additional .NET runtimes or SDKs:
https://aka.ms/dotnet-download

Visual Studio Code Extensions

|Extension|Author|Version|
|---|---|---|
|azps-tools|azps-tools|0.2.1|
|azure-account|ms-vscode|0.9.9|
|csharp|ms-dotnettools|1.23.16|
|vscode-azureresourcegroups|ms-azuretools|0.4.0|
|vscode-azurevirtualmachines|ms-azuretools|0.4.1|
|vscode-docker|ms-azuretools|1.17.0|;