Explanation

This replaces all use of MetaMask/github-tools workflows, usually referenced by a specific commit hash, with (composite) actions, referenced by a version. This has several benefits:

• We can update actions used simply by creating a new release in the github-tools repository, propagating the changes to all repositories using the version.
  • Breaking changes can still be made by creating a major release.
• Actions have access to certain variables that workflows don't have access to, letting us omit input options like github-tools-ref.
• In cases where we're already running other steps, using an action avoids spinning up a new runner.

References

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them