Migration needed for incompatible_no_implicit_file_export

[hofbi]

https://buildkite.com/bazel/bcr-bazel-compatibility-test/builds/723/steps/canvas?sid=019b8ddb-dbce-435c-ac42-83e076aed198#019b8ddb-de5c-43c5-9679-c06cd62b7e1d/L315 fails with --incompatible_no_implicit_file_export.

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

[hofbi]

@restingbull as you assigned this to yourself, when do you plan to start working on this?

[agluszak]

Hm, this seems to be related to #1434, am I correct? Because when I put the flag in my .bazelrc, development bazel build //... succeeds

[hofbi]

@agluszak What would you suggest here? Is #1434 something you plan to do soon?

[restingbull]

I'm intending to clear it out shortly.