Sync GitHub workflows with module template

[mcmire]

Description

This commit ensures that the GitHub workflows (minus anything documentation-related) and other files in .github are synced with the module template.

• Add pull request template
• Add compatibility test
• Use checkout-and-setup action, avoid the use of actions/cache for publishing
• Bump to action-create-release-pr v4
  • This may address a bug where if the changelog is updated fully before attempting to create an RC, the Create Pull Request workflow cannot be run. v1 is likely using an old version of @metamask/auto-changelog.
• Bump to action-publish-release v3
• Bump to action-npm-publish v5
• Bump to action-security-code-scanner v1
• Notify Slack when new release is ready for approval
• Remove unused get-release-version step

References

Compare the changes in this commit with the .github directory in the module template.

[github-advanced-security[bot]]

This pull request sets up GitHub code scanning for this repository. Once the scans have completed and the checks have passed, the analysis results for this pull request branch will appear on this overview. Once you merge this pull request, the 'Security' tab will show more code scanning analysis results (for example, for the default branch). Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results. For more information about GitHub code scanning, check out the documentation.