Prepare CRW build system for CPaaS integration

As of CRW 2.2.0 not all upstream to downstream repos are automatically synced or have places we can improve.

• operator-metadata: TODO: sync crd & csv from upstream 7.y.z -> 2.y.z, apply changes via sed DONE
  • update deploy/operator*.yaml with specific tags (:2.y-zzz instead of :2.y) - CRW-828 DONE

• plugin registry: tech debt: update Jenkinsfile to new devfile style w/ cleaner sed transforms & more close alignment to upstream DONE

• crw-theia:
  • tech debt: build sometimes runs out of disk. Add naginator to retrigger? not a problem anymore; cleaning up between container builds so as to save space MITIGATED
  • ensure dev, then theia, then endpoint are built IN ORDER (not in parallel): DONE

• crw-server:
  • tech debt: merge build & sync jobs into a single job: DONE

• others / overall:
  • All code in pkgs.devel should have a matching GH repo that is simply a 1:1 sync. That would allow us to see/share/PR code more easily. CRW-797 DONE
  • All existing sync jobs would of course need to be updated to sync to new midstream GH repo(s) rather than pushing directly to pkgs.devel - followup in CRW-1275

Overall status tracker:

• https://docs.google.com/spreadsheets/d/1TllnofYIlA7yTn7hIa8-LojGpHR1ACk1hVP-7fg_wsY/edit#gid=1755731151