[hack] Add create-release-tag.py script

Adds a script to create consistent annotated release tags for WMCO.

The commit SHA is resolved from the bundle image in the Red Hat Container
Catalog, preferring the org.opencontainers.image.revision OCI label (full
SHA) and falling back to the short-SHA image tag — matching the approach
used by hack/verify-release.py. The tag date is set to the operator
image's push_date so the timestamp reflects the actual release date.

A --commit override is available for releases not present in the catalog
(e.g. backport-only releases), and --date allows overriding the publish
date. The script prompts for confirmation before creating the tag and
prints the push command targeting the upstream repository.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: mtnbikenc