Modify GitHub Actions Workflow to leverage draft mode status and remove merge queue

[karangattu]

Modify GitHub Actions Workflow to accommodate the following -

• Remove merge queue from all the jobs
• Split the playwright jobs into multiple jobs per browser - e.g. Ubuntu 3.12 - Firefox, Ubuntu 3.12 - Chrome
  • All jobs should be done within ~ 4 mins
  • When merged we would need to adjust the required jobs in repo settings
• If the PR is in draft mode, only run Ubuntu checks for all job types
• If PR is not in draft mode, run all jobs
• when switching from Draft PR -> ready for review, all jobs should be automatically run without a commit

on:
  pull_request:
    types: [opened, synchronize, reopened, ready_for_review]

Reference doc for draft conditions
Reference for PR

[gadenbuie]

For extra context, here are the places where I've encountered friction with the merge queue:

1. The tests in the merge queue are still sometimes flaky and can fail. AFAICT, you can't rerun an individual job like you can in a PR branch, so you have to add the PR back to the merge queue. If a flaky test fails on a different runner, you end up repeating the process.

   With PR checks, I can re-run individual checks until I get an overall green check before merging.

2. The merge queue tends to obscure the workflow. I find it harder to see the checks in general, but they're impossible to review on GitHub's mobile app. I often look through failing checks or trigger a re-run from my phone for PR checks, but can't do this for merge queue checks.