New policy test - 2 files

[dotnet-issue-labeler[bot]]

I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

[dotnet-issue-labeler[bot]]

I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

[learn-build-service-prod[bot]]

Learn Build status updates of commit e4289bc:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
xml/System.Formats.Nrbf/NrbfDecoder.xml	:white_check_mark:Succeeded	View
xml/System.Net.Cache/HttpCacheAgeControl.xml	:white_check_mark:Succeeded	View

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