Test jobs will run if
* Either the PR is non-draft or has the "DraftRunCI" label set *AND*
* One of the following:
* Certain files were changed *OR*
* The PR is non-draft and has the "Ready to merge" flag *OR*
* The workflow is being run from the merge queue.
Additionally, a meta "passed" job was added that is dependent on all the other test jobs, so the required jobs list under branch protection rules only needs to specify "passed" to ensure that *either* all the test jobs pass *or* all the test jobs are skipped because they don't need to be run.
This allows PRs that don't affect the build or binary to be merged without overriding.
This change removes `labeled` and `unlabeled` as pipeline trigger actions, and instead adds `reopened` and `ready_for_review`. The logic whether to run the pipeline jobs is then simplified, although to get a draft PR with the `DraftCIRun` label to run it can be necessary to close and reopen a PR.
The change updates how clang-format is called in CI and locally, and adds prettier to the pre-commit hook. Proto files are now also formatted, while external files are excluded.
