[release/6.0] Define SystemReflectionMetadataStaticVersion to workaround source-build issues. #59782
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This fixes the underlying issue that manifested itself as #58800.
The core issue is that when building in source-build, the SystemReflectionMetadataVersion gets overridden to the source-built version (6.0) which causes assembly resolution issues impacting crossgen2. The long term solution is a 7.0 source-build feature which would eliminate the SystemReflectionMetadataVersion override because the dependency is not defined in the repo's Version.Details.xml file.