feat(ci): add release mr creation job - backport to 2.7.x release branch

Wolfgang Silbermayrrequested to merge
backport-enroll-ci-job-for-release-mr-creation into release/v2.7.x

feat(ci): add release mr creation job - backport to 2.7.x release branch

See #3173

(cherry picked from commit 4c998561)

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