Move to net8.0 (#1463)

* Added net8.0 to the dotnet-version array used by actions

* Changed framework version in Directory.Build.props

* Removed unsed nuget

* Update codeql-analysis.yml

* Added net8.0 target framework

* Updated code analyzer version to match net8.0

* Added net8.0 to tests

* Updated sdk version

* Updated version.json

* Fixed build for non windows machines

* Updated references in Directory.Build.targets

* Added conditional exception handling to WatchServerDisconnect test case

* Added missing project to solution

.github/workflows/docfx.yaml

@@ -34,7 +34,8 @@ jobs:
       with:
         dotnet-version: |
           6.0.x
-          7.0.x
+          7.0.x
+          8.0.x
 
     - name: Build
       run: dotnet build