Create annotated tags via `release` keyword

Release notes

In 15.3, we are adding the ability to create an annotated tag when creating a release in the ci-cd.yaml file.

Problem

As a follow-up of #268018 (closed), we should extend the release keyword in .gitlab-ci.yml to create an annotated tag.

Proposal

Add tag_message keyword under release.

Implementation plan

Add tag_message to SINGLE_FLAGS in Gitlab::Ci::Build::Releaser.