Add `/relate` quick action to WorkItems

What does this MR do and why?

Add /relate quick action to WorkItems. Also:

  • re-word the quick action as requested on the issue
  • ensure the /relate command work with group related work items (like epics)
  • and added the GraphQL trigger to ensure the UI is updated

Related to: #420793 (closed)

Changelog: added

References

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Screenshots or screen recordings

relate

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Edited by Kassio Borges

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