[CI-only] Use pattern matching for release_branches

[mdeggies]

Description

Pattern matching was recently added so that teams no longer have to explicitly list every branch that should trigger the CRT pipeline. This simplifies release preparation- anytime a new release branch is created, it will produce releasable artifacts and exercise the full pipeline.

Testing & Reproduction steps

This has been tested in multiple projects since being rolled out. There are no vault-specific tests that need to be done.

Links

PR where this functionality was added: https://github.com/hashicorp/crt-orchestrator/pull/51

PR Checklist

• [ ] updated test coverage
• [ ] external facing docs updated
• [X] not a security concern