Merged PR 43043: [internal/release/8.0.1xx] Updated SourceBuildPrebuiltBaseline.xml - add System.Reflection.Metadata 8.0.0

Updated SourceBuildPrebuiltBaseline.xml - add
 - System.Reflection.Metadata 8.0.0

----
#### AI description  (iteration 1)
#### PR Classification
Configuration update.

#### PR Summary
This pull request updates the `SourceBuildPrebuiltBaseline.xml` to include a new usage pattern for `System.Reflection.Metadata` version 8.0.0.
- `eng/SourceBuildPrebuiltBaseline.xml`: Added `System.Reflection.Metadata/*8.0.0*` to the ignore patterns.

Author: vseanreesermsft

eng/SourceBuildPrebuiltBaseline.xml

@@ -13,5 +13,7 @@
 
     <!-- These are coming in via runtime but the source-build infra isn't able to automatically pick up the right intermediate. -->
     <UsagePattern IdentityGlob="Microsoft.NETCore.App.Crossgen2.linux-x64/*8.0.*" />
+    
+    <UsagePattern IdentityGlob="System.Reflection.Metadata/*8.0.0*" />
   </IgnorePatterns>
 </UsageData>