Revert "Update Source-Build SDK Diff Tests Baselines and Exclusions" (dotnet#42481)

Author: ellahathaway

src/SourceBuild/content/test/Microsoft.DotNet.SourceBuild.SmokeTests/assets/SdkContentTests/MsftToSbSdkFiles.diff

@@ -59,13 +59,4 @@ index ------------
 -./sdk/x.y.z/Microsoft.CodeCoverage.IO.dll
  ./sdk/x.y.z/Microsoft.Common.CrossTargeting.targets
  ./sdk/x.y.z/Microsoft.Common.CurrentVersion.targets
- ./sdk/x.y.z/Microsoft.Common.overridetasks
-@@ ------------ @@
- ./sdk/x.y.z/Roslyn/bincore/ru/Microsoft.CodeAnalysis.CSharp.resources.dll
- ./sdk/x.y.z/Roslyn/bincore/ru/Microsoft.CodeAnalysis.resources.dll
- ./sdk/x.y.z/Roslyn/bincore/ru/Microsoft.CodeAnalysis.VisualBasic.resources.dll
-+./sdk/x.y.z/Roslyn/bincore/System.Collections.Immutable.dll
-+./sdk/x.y.z/Roslyn/bincore/System.Reflection.Metadata.dll
- ./sdk/x.y.z/Roslyn/bincore/tr/
- ./sdk/x.y.z/Roslyn/bincore/tr/Microsoft.CodeAnalysis.CSharp.resources.dll
- ./sdk/x.y.z/Roslyn/bincore/tr/Microsoft.CodeAnalysis.resources.dll
+ ./sdk/x.y.z/Microsoft.Common.overridetasks

src/SourceBuild/content/test/Microsoft.DotNet.SourceBuild.SmokeTests/assets/SdkContentTests/SdkFileDiffExclusions.txt

@@ -1,7 +1,7 @@
 # This list is processed using FileSystemName.MatchesSimpleExpression
 #
 # Format
-#   Exclude the path entirely: 
+#   Exclude the path entirely:
 #     <path> [# comment]
 #   Exclude a path from a specific sdk:
 #     <path>|{msft|sb} [# comment]
@@ -34,7 +34,7 @@
 ./sdk/x.y.z/Sdks/Microsoft.SourceLink.Bitbucket.Git/tools/net472/|msft
 ./sdk/x.y.z/Sdks/Microsoft.SourceLink.Common/tools/net472/|msft
 ./sdk/x.y.z/Sdks/Microsoft.SourceLink.GitHub/tools/net472/|msft
-./sdk/x.y.z/Sdks/Microsoft.SourceLink.GitLab/tools/net472/|msft 
+./sdk/x.y.z/Sdks/Microsoft.SourceLink.GitLab/tools/net472/|msft
 
 # vstest localization is disabled in Linux builds - https://github.com/dotnet/source-build/issues/3517
 ./sdk/x.y.z/*/Microsoft.CodeCoverage.IO.resources.dll|msft
@@ -87,3 +87,7 @@
 # Needed for source-built NativeAOT with the source-built SDK
 ./library-packs/|sb
 ./packs/runtime.banana-rid.Microsoft.DotNet.ILCompiler/|sb
+
+# https://github.com/dotnet/source-build/issues/4534
+./sdk/x.y.z/Roslyn/bincore/System.Collections.Immutable.dll|sb
+./sdk/x.y.z/Roslyn/bincore/System.Reflection.Metadata.dll|sb