Migration needed for incompatible_no_implicit_file_export

[hofbi]

See https://buildkite.com/bazel/bcr-bazel-compatibility-test/builds/727/steps/canvas?sid=019b970b-3dad-4042-b8f0-4b22d6a579c4#019b970b-408b-4e84-a167-652280758dbc/L695

Found while working on bazelbuild/bazel#27674 (comment)

[hofbi]

@cgrindel is this something you would want to be fixed before flipping the flag?

[cgrindel]

@hofbi I have not had a chance to dig into this yet. I think that I will have some time this weekend to understand what needs to be done.