* Update .NET Framework references to 9.0.0

* OK fine update sourcebuild too

* fixup! OK fine update sourcebuild too

* fixup! OK fine update sourcebuild too

* Add new dependencies

* Formats.Nrbf depends on Bcl.HashCode

* Don't ngen S.Resources.Extensions

This is ngen-ing in vsn context but it shouldn't
ever be used from the amd64 directory; that copy is for compat with
badly-written API users only.

* SRE pkgdef version bump too

* Official Build MpPreference workaround (#11464)

Try disabling AV in the official build script to avoid build breaks that manifest as

```
D:\a\_work\1\s\.packages\microsoft.dotnet.arcade.sdk\9.0.0-beta.24516.2\tools\Sign.proj(72,5): error MSB4018: The "Microsoft.DotNet.SignTool.SignToolTask" task failed unexpectedly.
System.Runtime.Serialization.SerializationException: Type 'System.AssemblyLoadEventArgs' in assembly 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' is not marked as serializable.
   at Microsoft.Build.BackEnd.Components.RequestBuilder.AssemblyLoadsTracker.CurrentDomainOnAssemblyLoad(Object sender, AssemblyLoadEventArgs args)
   at System.AppDomain.OnAssemblyLoadEvent(RuntimeAssembly LoadedAssembly)
   at Microsoft.Build.Framework.ITask.Execute()
   at Microsoft.Build.BackEnd.TaskExecutionHost.Execute()
   at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext() [D:\a\_work\1\s\.packages\microsoft.dotnet.arcade.sdk\9.0.0-beta.24516.2\tools\Sign.proj]
```

---------

Co-authored-by: Jan Provaznik <janprovaznik@microsoft.com>

* Add DiagnosticSource to SB baseline

* One DiagnosticSource

---------

Co-authored-by: Jan Provaznik <janprovaznik@microsoft.com>

…#11540)

Fixes #
CodeQL SM03800 issue

Context
CodeQL is flagging unapproved usage of DSACryptoServiceProvider

Changes Made
The flagged code is not required in ClickOnce so deleting it.

Testing
ClickOnce signing scenarios validated from .NET Fx 3.5 through .NET 9.

Notes

…11538)

* revert "Revert ".slnx support - use the new parser for .sln and .slnx (#10836)""

* opt-in sln parsing with SolutionPersistence

* add SlnParsingWithSolutionPersistenceOptIn to Traits

* bring back comment about revertin .sln parsing with SolutionPersistence in ChangeWaves

* fix tests

* remove empty line

* opt-in and -out of sln parsing with the new parser in SolutionFileTests

* fix tests without using common testenv

* fix tests

* fix

* rename env var to MSBUILD_PARSE_SLN_WITH_SOLUTIONPERSISTENCE

* fix closing bracket

* change ParseSolutionHelper to call SolutionFile.Parse

added test checking that targets from these files are included in the project