ci: Cache 25000 RuboCop files and add debugging for RuboCop

Rémy Coutablerequested to merge
327257-run-rubocop-in-a-dedicated-job into master

What does this MR do?

  1. Cache more files in RuboCop cache (25 000 files)
  2. Don't pull and push, but always push the cache in update-static-analysis-cache
  3. Add debugging statements so that we can check RuboCop cache usage in more pipelines

Related to #327257 (closed).

Edited by Rémy Coutable

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