BCR PR reviewer: add presubmit-auto-run for known module maintainer (#2414)

Follow up:
https://github.com/bazelbuild/continuous-integration/pull/2411

This PR changes the condition for `presubmit-auto-run` to:
1. This label hasn't been added already
2. If the PR author is a known module maintainers or at least one of the
modules has got maintainer approval
3. If the PR author has already contributed to the BCR before
1 file changed