Critical capabilities changes were detected without any change made to the project

_From @vsfeedback on June 16, 2018 15:5_

1. git clone https://github.com/dotnet/docfx.git
2. open the All.sln
3. error: The project system has encountered an error.

Internal error: Critical capabilities changes were detected without any change made to the project 'Microsoft.DocAsCode.Metadata.ManagedReference.FSharp.Tests.fsproj', and forces the project to be reloaded. Potential capabilities involved: 'FSharp'.

I meet this error after upgrading to vs 15.7.3. I found several issues with similar error message that have been fixed in 15.3, but I think it's not the same issue for me.

```
Details:

LimitedFunctionality
System.AggregateException: One or more errors occurred. ---> System.InvalidOperationException: Internal error: Critical capabilities changes were detected without any change made to the project 'Microsoft.DocAsCode.Metadata.ManagedReference.FSharp.fsproj', and forces the project to be reloaded. Potential capabilities involved: 'FSharp'.
at Microsoft.VisualStudio.ProjectSystem.ProjectCapabilitiesRequirementsService.<RequestReloadForIncompatibleCapabilitiesAsync>d__20.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at Microsoft.VisualStudio.ProjectSystem.CommonProjectSystemTools.Rethrow(Exception ex)
at Microsoft.VisualStudio.ProjectSystem.ProjectErrorReporting.<>c__DisplayClass6_0.<SubmitErrorReport>b__0()
at Microsoft.VisualStudio.ProjectSystem.ExceptionFilter.<>c__DisplayClass2_0.<Guard>b__0()
at GuardMethodClass.GuardMethod(Func`1 , Func`2 , Func`2 )
--- End of stack trace from previous location where exception was thrown ---
at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject)
--- End of inner exception stack trace ---
---> (Inner Exception #0) System.InvalidOperationException: Internal error: Critical capabilities changes were detected without any change made to the project 'Microsoft.DocAsCode.Metadata.ManagedReference.FSharp.fsproj', and forces the project to be reloaded. Potential capabilities involved: 'FSharp'.
at Microsoft.VisualStudio.ProjectSystem.ProjectCapabilitiesRequirementsService.<RequestReloadForIncompatibleCapabilitiesAsync>d__20.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at Microsoft.VisualStudio.ProjectSystem.CommonProjectSystemTools.Rethrow(Exception ex)
at Microsoft.VisualStudio.ProjectSystem.ProjectErrorReporting.<>c__DisplayClass6_0.<SubmitErrorReport>b__0()
at Microsoft.VisualStudio.ProjectSystem.ExceptionFilter.<>c__DisplayClass2_0.<Guard>b__0()
at GuardMethodClass.GuardMethod(Func`1 , Func`2 , Func`2 )
--- End of stack trace from previous location where exception was thrown ---
at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject)<---
```
_This issue has been moved from https://developercommunity.visualstudio.com/content/problem/267201/critical-capabilities-changes-were-detected-withou-1.html
VSTS ticketId: 626735_
_These are the original issue comments:_
(no comments)
_These are the original issue solutions:_
(no solutions)

_Copied from original issue: Microsoft/visualfsharp#5205_