chore: standardize release process

[tylerjroach]

No description provided.

[rahul-mixpanel]

Review Summary

The Maven adaptations look good overall. The multi-module setup with analytics and openfeature is well structured. A few issues to address:

Issue: Unpinned Action SHAs

This PR uses version tags (e.g., actions/checkout@v4) instead of pinned SHAs like the other repos. For consistency and security, consider pinning:

Current	Pinned SHA
actions/checkout@v4	actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
actions/setup-java@v4	actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654
actions/cache@v4	actions/cache@... (get latest SHA)

Same suggestions as other PRs:

1. PR title check - Currently only allows feat|fix|chore types.

2. Changelog generation - Only captures commits with module scope.

3. README update - The sed pattern fails silently if format doesn't match.

4. Draft release notes - Consider adding a fallback if notes extraction returns empty.

---

Good to merge after pinning action SHAs for consistency with other Mixpanel repos.