No need to run this workflow on all PRs, only those that
change the Python dependency installation mechanism.

Mergeback v2.1.17 refs/heads/releases/v2 into main

…-path-filters

CI: Add path filters to python-deps workflow

Reduce the number of concurrent jobs.
This will require a branch protection rule update,
renaming `check-js` to Check JS` and removing `Lint`.

…t-check-js

CI: Combine JS lint and JS check jobs

Refactor the PR checks workflow into two workflows:
PR checks and Runner checks.

This does not change the actual check jobs that are run.
It also does not change the expected check names
(which rely only on the job name, not the workflow name).

This makes it easier to inspect workflow run summaries in the UI
and to separately retry subsets of failed jobs in case of flakiness.

In future we will clean up the Runner checks,
since this is a deprecated component.

…nner-checks

CI: Move Runner checks into their own workflow

Reduce the number of concurrent jobs by 1.
Run these checks in succession instead, as the
`check-file-contents` job in the PR checks workflow.

…eck-file-contents

CI: Combine verify-pr-checks and check-for-conflicts jobs

Update default CodeQL version to 2.10.2