Filter in Ruby to work around API 500 error

What does this MR do and why?

Context: #1164 (comment 1216627782)

This requires (work-in-progress) gitlab-org/ruby/gems/gitlab-triage!270 (merged)

Expected impact & dry-runs

• (After, filter_in_ruby: true) Job duration 1 minute https://gitlab.com/gitlab-org/quality/triage-ops/-/jobs/3535174269

  * Found 963 resources...
  * Filtering resources...
  * Total after filtering: 16 resources
  * Limiting resources...
  * Total after limiting: 16 resources

Now comparing this to filtering in API:

• (Before, filter_in_ruby: false) Job duration 24 seconds https://gitlab.com/gitlab-org/quality/triage-ops/-/jobs/3535268243

  * Found 24 resources...
  * Filtering resources...
  * Total after filtering: 24 resources
  * Limiting resources...
  * Total after limiting: 24 resources

I believe using API should be faster, but who knows, maybe it's really less stable and 30 seconds isn't too much longer for something we run weekly anyway!

Action items

• (If applicable) Add documentation to the handbook pages for Triage Operations =>
• (If applicable) Identify the affected groups and how to communicate to them:
  • /cc @person_or_group =>
  • Relevant Slack channels =>
  • Engineering week-in-review