Use artifacts to share the eslint and styleint caches from core to MRs

eslint doesn't appear to have a verbose option, so it's hard to show this definitely working, but
https://git.drupalcode.org/project/drupal/-/jobs/2258295 is a job from a sandbox MR, where the cspell and phpstan jobs both had cache hits, and eslint running with the same logic. eslint job completed in 51 seconds.

https://git.drupalcode.org/project/drupal/-/jobs/2257804 is a job with the current logic and the eslint job took 1m45s.

You can also see that the cache warming job generates the .eslintcache file correctly: https://git.drupalcode.org/project/drupal/-/jobs/2258024

I also tested the same command locally and the caching worked there.

We should do eslint and stylelint in a single PR since their cache strategies are the same.

https://git.drupalcode.org/project/drupal/-/jobs/2259023 this shows stylelint caching working in my sandbox branch/MR with the cache target pointing to itself.

📌 Use artifacts to share the phpstan result and cspell caches from core to MRs Downport is in, so rebased here and unpostponing.

per the slack conversation @catch shared this https://git.drupalcode.org/project/drupal/-/merge_requests/8952/diffs which believe shows this working. Going to mark.

question in MR

Good spot on the MR, since it's a trivial change, moving back to RTBC.

nod_ → closed merge request !8964

Committed 5374786 and pushed to 11.x. Thanks!
Committed 1161b8d and pushed to 11.0.x. Thanks!

Automatically closed - issue fixed for 2 weeks with no activity.