Remove Roslyn 5.0.0 workaround and update test dependency

Eliminated the temporary workaround for Roslyn 5.0.0 in the props file and updated the test project's Microsoft.CodeAnalysis.CSharp.Workspaces package reference from 5.0.0-2.final to 5.0.0. This aligns the configuration with the stable Roslyn release.

Author: Sergio0694

src/CommunityToolkit.Mvvm.SourceGenerators/CommunityToolkit.Mvvm.SourceGenerators.props

@@ -45,9 +45,6 @@
 
     <!-- Disable the removed rules analyzer for older Roslyn versions (as we might not support all diagnostics) -->
     <NoWarn Condition="$([MSBuild]::VersionLessThan($(MvvmToolkitSourceGeneratorRoslynVersion), 5.0.0))">$(NoWarn);RS2003</NoWarn>
-
-    <!-- Temporary workaround before GA -->
-    <MvvmToolkitSourceGeneratorRoslynVersion Condition="$([MSBuild]::VersionEquals($(MvvmToolkitSourceGeneratorRoslynVersion), 5.0.0))">5.0.0-2.final</MvvmToolkitSourceGeneratorRoslynVersion>
   </PropertyGroup>
 
   <ItemGroup>

tests/CommunityToolkit.Mvvm.SourceGenerators.Roslyn5000.UnitTests/CommunityToolkit.Mvvm.SourceGenerators.Roslyn5000.UnitTests.csproj

@@ -15,7 +15,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Analyzer.Testing" Version="1.1.2" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.CodeFix.Testing" Version="1.1.2" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="5.0.0-2.final" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="5.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.0" />
     <PackageReference Include="MSTest.TestAdapter" Version="4.0.1" />
     <PackageReference Include="MSTest.TestFramework" Version="4.0.1" />