Draft: Release Environment - Create out of policy environments

In #20010 (closed), we remove out of policy release environments following our GitLab version maintenance policy. However, sometimes, we want to make backports to old versions. We can also do it manually by adding a new <versions>/environment.yaml file, but is nicer to have it automatically, and not conflict with the logic to remove out of policy release environments (one idea: add a new field to the tenant model of release environment, to specify that this environment is created out-of-policy).

Exit Criteria

• A release environment is created (or ready) when a new change is pushed to an out of maintenance policy branch
• The new release environment is not destroyed by the logic in #20010 (closed)