move watches across to the new cluster and start managing index patterns and cluster settings

Michal Wasilewskirequested to merge
michalw/moving-objects-across into master

related to: https://gitlab.com/gitlab-com/gl-infra/infrastructure/issues/8005

Covers:

  • index patterns
  • watches
  • cluster settings
  • relevant CI jobs
  • a few updates to shared functions
  • a doc update (related to index patterns)
Edited by Michal Wasilewski

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