provenance: Work on heads instead of all revisions

Revisions are causing scaling issues, let's try with releases and head revisions instead, which should be more tractable

Jenkins job DGRPH/gitlab-builds #676 failed .
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added 12 commits

• 86a7dee5...e1edbbb6 - 9 commits from branch master
• 6cd0bf53 - Merge branch 'master' into provenance-rel
• e16f312f - Detect revisions pointed by releases as heads
• 37e53d34 - Update tests to work with heads

Compare with previous version

changed title from provenance: Work on heads instead of revisions to provenance: Work on heads instead of all revisions

Jenkins job DGRPH/gitlab-builds #681 succeeded .
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merged

changed milestone to %Provenance in production [Roadmap - Tooling and infrastructure]