chore: Add release action

[ChristopherChudzicki]

What are the relevant tickets?

For https://github.com/mitodl/hq/issues/6039

Description (What does it do?)

This PR adds semantic-release to release this package. It:

• inspects commits since last release to construct changelog + decide next version number (major/minor/patch)
  • only commits using conventional commit are included
  • Since we usually squash commits, this repo is set to use PR title as default squashed commit message, and we enforce conventional commit PR titles.
• publishes the release to NPM and github releases page

How can this be tested?

1. Read the readme. It should make sense.
2. View the "Release" section of https://github.com/mitodl/smoot-design/actions/runs/11846407719/job/33013978096 to see example changelog based on this branch + some empty test commits.
   • you can trigger this with github CLI via gh workflow run release --ref cc/releasing. Once this PR is merged, it can be manually triggered via action button.
3. Change this PR title to something that is not a conventional commit; the PR check should fail with a somewhat useful message.
   • change it back, and the message should be deleted.

Checklist:

• Write a README section
• remove cc/releasing from .releaserc

[rhysyngsun]

One thing

[rhysyngsun]

Should this still have --dry-run?

[ChristopherChudzicki]

No!

[ChristopherChudzicki]

Thanks. Removed that, and removed cc/releasing from the releaserc branches section.

[rhysyngsun]

LGTM

[ChristopherChudzicki]

🎉 This PR is included in version 1.0.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

Your semantic-release bot 📦🚀