Experiment: Add GitHub action to enforce tasks are checked off

[dddlr]

Adding detection for incomplete tasks in a PR description.

• [x] This is an example GitHub action
  • [x] I hope to check
• [x] Add PR template
  • https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/creating-a-pull-request-template-for-your-repository
• [x] Decide whether to put node_modules/ into .github/actions/task-checklist to speed things up

• [ ] Hello world
• [ ] This has been exempted from the task checklist

You can exempt parts the PR description from the check by adding <!-- task-checklist-ignore-start --> and <!-- task-checklist-ignore-end --> around the sections where you want to disable the check.

Alternative methods considered:

• https://github.com/kentaro-m/task-completed-checker-action doesn't appear to work
• https://github.com/venkatsarvesh/pr-tasks-completed-action doesn't give a way to skip the check

Also, with an in-house solution, we can easily extend it in the future and not need to worry about nobody owning the code.

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: 220a8819dcd09a412fbacb6ca86c3505344458b5

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[netlify[bot]]

✅ Deploy Preview for compiled-css-in-js canceled.

Name	Link
🔨 Latest commit	220a8819dcd09a412fbacb6ca86c3505344458b5
🔍 Latest deploy log	https://app.netlify.com/sites/compiled-css-in-js/deploys/6695cb492d2f090008b5a69c

[dddlr]

Will make a new PR with squashed commits