We can continue to limit the coverage comment workflow to django/django,
but now that this workflow is the main python test workflow, it should
run on forks by default. The other tests workflow (currently running
only JavaScript tests) may start running python tests again once we flesh
out the matrix, but since it was duplicating the coverage tests configuration,
we temporarily removed it.
Follow-up to 26b0e2bb92.
Follow-up to a89183e638, which was
reverted in e4c4a178aa because a change
to the workflow trigger resulted in the PR branch not being checked out.
We used this opportunity to reimplement the coverage tracing and coverage
commenting in a two-workflow pattern with more granular permissions.
To reduce duplicative workflows, we removed the existing python test workflow
on PRs, at least until we run more distinct configurations on GitHub actions. The
run with coverage tracing enabled is sufficient for now. The existing workflow still
runs on pushes to main. We can revisit when adding more test configurations.
