Dotnet watch does not trigger on file change with Windows Containers

## Steps to reproduce the issue
1. Clone the `dotnet-docker` repository
2. Switch Docker to Windows Containers
3. `docker run --rm -it -p 8000:80 -v c:\dev\dotnet-docker\samples\aspnetapp:c:\app\ -w \app\aspnetapp -e ASPNETCORE_URLS=http://*:80 --name aspnetappsample mcr.microsoft.com/dotnet/core/sdk:3.1 dotnet watch run --no-launch-profile`
* Adjust path as needed
4. Browse to http://localhost:8000/
5. Make a change in `samples\aspnetapp\aspnetapp\Pages\Index.cshtml` and save
6. Refresh browser

## Expected behavior
* Recompile is seen in container output
* Refresh reflects change in `Index.cshtml`

## Actual behavior
* Watcher does not trigger
* Change is not reflected in output

Output with `-v` does indicate that the polling file watcher is enabled, and that the change is seen, but the `dotnet` process can't be stoppped.
```
watch : Polling file watcher is enabled
watch : Running MSBuild target 'GenerateWatchList' on 'C:\app\aspnetapp\aspnetapp.csproj'
watch : Started 'dotnet' with process id 1512
watch : Process id 1512 ran for 1705ms
watch : Watching 13 file(s) for changes
watch : -> C:\app\aspnetapp\Pages\Error.cshtml
watch : -> C:\app\aspnetapp\Pages\Index.cshtml
watch : -> C:\app\aspnetapp\Pages\Privacy.cshtml
watch : -> C:\app\aspnetapp\Pages\Shared\_Layout.cshtml
watch : -> C:\app\aspnetapp\Pages\Shared\_ValidationScriptsPartial.cshtml
watch : -> C:\app\aspnetapp\Pages\_ViewImports.cshtml
watch : -> C:\app\aspnetapp\Pages\_ViewStart.cshtml
watch : -> C:\app\aspnetapp\Pages\Error.cshtml.cs
watch : -> C:\app\aspnetapp\Pages\Index.cshtml.cs
watch : -> C:\app\aspnetapp\Pages\Privacy.cshtml.cs
watch : -> C:\app\aspnetapp\Program.cs
watch : -> C:\app\aspnetapp\Startup.cs
watch : -> C:\app\aspnetapp\aspnetapp.csproj
watch : Started 'dotnet' with process id 1816
watch : Running dotnet with the following arguments: run --no-launch-profile
watch : Started
warn: Microsoft.AspNetCore.DataProtection.Repositories.FileSystemXmlRepository[60]
Storing keys in a directory 'C:\Users\ContainerUser\AppData\Local\ASP.NET\DataProtection-Keys' that may not be per
sisted outside of the container. Protected data will be unavailable when container is destroyed.
info: Microsoft.Hosting.Lifetime[0]
Now listening on: http://[::]:80
info: Microsoft.Hosting.Lifetime[0]
Application started. Press Ctrl+C to shut down.
info: Microsoft.Hosting.Lifetime[0]
Hosting environment: Production
info: Microsoft.Hosting.Lifetime[0]
Content root path: C:\app\aspnetapp
watch : Killing process 1816
watch : Error while killing process 'dotnet run --no-launch-profile': The system cannot find the file specified.
watch : System.ComponentModel.Win32Exception (2): The system cannot find the file specified.
at System.Diagnostics.Process.StartWithCreateProcess(ProcessStartInfo startInfo)
at System.Diagnostics.Process.Start()
at System.Diagnostics.Process.Start(ProcessStartInfo startInfo)
at Microsoft.Extensions.Internal.ProcessExtensions.RunProcessAndWaitForExit(String fileName, String arguments, TimeSp
an timeout, String& stdout) in C:\dev\aspnetcore\src\Shared\Process\ProcessExtensions.cs:line 108
at Microsoft.Extensions.Internal.ProcessExtensions.KillTree(Process process, TimeSpan timeout) in C:\dev\aspnetcore\s
rc\Shared\Process\ProcessExtensions.cs:line 25
at Microsoft.Extensions.Internal.ProcessExtensions.KillTree(Process process) in C:\dev\aspnetcore\src\Shared\Process\
ProcessExtensions.cs:line 18
at Microsoft.DotNet.Watcher.Internal.ProcessRunner.ProcessState.TryKill() in C:\dev\aspnetcore\src\Tools\dotnet-watch
\src\Internal\ProcessRunner.cs:line 152
```

## Additional information (e.g. issue happens only occasionally)
This seems to work fine with Linux Containers:
```
docker run --rm -it -p 8000:80 -v c:\dev\dotnet-docker\samples\aspnetapp:/app -w /app/aspnetapp -e ASPNETCORE_URLS=http://+:80 --name aspnetappsample mcr.microsoft.com/dotnet/core/sdk:3.1 dotnet watch run --no-launch-profile
```

## Output of `docker version`

```
Client: Docker Engine - Community
Version: 19.03.8
API version: 1.40
Go version: go1.12.17
Git commit: afacb8b
Built: Wed Mar 11 01:23:10 2020
OS/Arch: windows/amd64
Experimental: false

Server: Docker Engine - Community
Engine:
Version: 19.03.8
API version: 1.40 (minimum version 1.24)
Go version: go1.12.17
Git commit: afacb8b
Built: Wed Mar 11 01:37:20 2020
OS/Arch: windows/amd64
Experimental: false
```

## Output of `docker info`

```
Client:
Debug Mode: false

Server:
Containers: 2
Running: 0
Paused: 0
Stopped: 2
Images: 132
Server Version: 19.03.8
Storage Driver: windowsfilter
Windows:
Logging Driver: json-file
Plugins:
Volume: local
Network: ics internal l2bridge l2tunnel nat null overlay private transparent
Log: awslogs etwlogs fluentd gcplogs gelf json-file local logentries splunk syslog
Swarm: inactive
Default Isolation: hyperv
Kernel Version: 10.0 18363 (18362.1.amd64fre.19h1_release.190318-1202)
Operating System: Windows 10 Enterprise Version 1909 (OS Build 18363.836)
OSType: windows
Architecture: x86_64
CPUs: 12
Total Memory: 31.81GiB
Name: LT-NWE1-T-US
ID: KJ3K:R3GY:FLRD:BAJT:4KZW:LFB3:KPOO:JMA7:Y5Y7:UYWE:MPYU:2M7U
Docker Root Dir: C:\ProgramData\Docker
Debug Mode: true
File Descriptors: -1
Goroutines: 28
System Time: 2020-06-09T11:49:31.7353616-04:00
EventsListeners: 1
Registry: https://index.docker.io/v1/
Labels:
Experimental: false
Insecure Registries:
127.0.0.0/8
Live Restore Enabled: false
Product License: Community Engine
```