Revert "Merge branch 'bwill/merge-commit-release-guard' into 'master'"

Why is this change being made?

This job does not work correctly inside release pipelines, and has blocked releases for 4.6.8 and 4.6.9.

• https://gitlab.com/gitlab-org/security-products/analyzers/container-scanning/-/pipelines/487401297
• https://gitlab.com/gitlab-org/security-products/analyzers/container-scanning/-/pipelines/488257828