navigation-lint-common hosts test helpers that generates TestFile.

However, TestFile is for test only and should not reside in production code. It leads to b/368070326. Instead, it should be in test-specific source sets.

We should refactor lint-common code into a new structure with common and common-test submodules

androidx.navigation:navigation-lint {
     common
     common-test
}

This was done in these CLs aosp/3284996. But this fix is blocked by recent bytecode migration in ag/29027860. During migration, the existing path "navigation:navigation-lint-common" was hardcoded into a workaround, so this new path breaks presubmit. Thread for context.

While waiting for an updated workaround or a patch from lint infra, we should in the meantime copy paste TestFile related code into each lint test artifact so that we restore lint in the mean time.