Fix error when the provided sonar host url is not a valid URI format

[sebastien-marichal]

When providing an URL that does not have a valid URI format, it produces a nonuser-friendly output.

Instead of the exception, a better user-friendly message should be reported.

Steps to reproduce

SonarScanner.MSBuild.exe begin /k:test /d:sonar.host.url=https:/google.com

Output

SonarScanner for MSBuild 5.13
Using the .NET Framework version of the Scanner for MSBuild
Pre-processing started.
Preparing working directories...
14:37:03.415  Updating build integration targets...

Unhandled Exception: System.UriFormatException: Invalid URI: The Authority/Host could not be parsed.
   at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind)
   at SonarScanner.MSBuild.Common.WebUtils.CreateUri(String uri)
   at SonarScanner.MSBuild.PreProcessor.PreprocessorObjectFactory.<CreateSonarWebServer>d__2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at SonarScanner.MSBuild.PreProcessor.PreProcessor.<DoExecute>d__7.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at SonarScanner.MSBuild.PreProcessor.PreProcessor.<Execute>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at SonarScanner.MSBuild.BootstrapperClass.<PreProcess>d__10.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at SonarScanner.MSBuild.BootstrapperClass.<Execute>d__8.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at SonarScanner.MSBuild.Program.<Execute>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at SonarScanner.MSBuild.Program.<Execute>d__3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at SonarScanner.MSBuild.Program.<Main>d__2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at SonarScanner.MSBuild.Program.<Main>(String[] args)