Only create system note on color change

Nicolas Dularrequested to merge
nd/color-change-system-note-only-on-update into master

What does this MR do and why?

Issue: #469464 (closed)

Only create system note on color change

We created a system note by default when a epic work item got created that the color got changed.

This should not happen on creation. We fixed this bug by using the after_update_commit callback instead of after_save_commit. The former only gets triggered on updates instead of creations.

Changelog: fixed EE: true

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Before After

How to set up and validate locally

  1. Enable work_item_epics feature flag
  2. Create an epic
  3. Before: a system note always got created when creating a new epic, that the color got changed
  4. After: no system note. Only when the color actually changes on an update
Edited by Nicolas Dular

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