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Use the diagnostic kind printing in #4425 to catch when we have diagnostics with no tests. This merges a couple other use-cases of filegroup manifests into a common rule. Note I do add a few tests for things, and also some things are _actually_ unit tested (just not in the file_test structure). But I stopped when I realized that dealing with merge conflicts is going to be a pain. I might end up reverting test changes (as part of merge conflict resolution) and doing narrow test additions in a separate PR, after both this and #4425 are merged.
Testing
Testing-specific libraries.