build: Add manual republish of packages

[nzakas]

Prerequisites checklist

• I have read the contributing guidelines.

What is the purpose of this pull request?

Allow for manual republishing of packages.

What changes did you make? (Give an overview)

• Added a new manual-publish.yml file that can be triggered by workflow dispatch, which goes through these steps:
  1. Finds the latest tag for the given package
  2. Checks out the latest tag
  3. Reads the version number from package.json
  4. Publishes to npm
  5. Publishes to JSR
  6. Tweets out release
• Updated the new package tool to also edit manual-publish.yml

Related Issues

refs #153

Is there anything you'd like reviewers to focus on?

[fasttime]

I've tested the manual publishing on a fork without the other changes in #151 and I think it's working well except for the incomplete package.json path.

[fasttime]

LGTM, thanks! Feel free to merge this now, or after #151 is merged if that was the plan.