Show error when removing epic or issue from epic

Florie Guibertrequested to merge
37065-removing-epic-issue-from-epic-does-not-show-error into master

What does this MR do and why?

Fixes showing error when removing epic or issue child from epic.

Screenshots or screen recordings

Screenshot_from_2022-10-13_12-01-42

How to set up and validate locally

  • Navigate to epic
  • Switch browser to offline mode
  • Remove issue or epic from Child issues and epics section
  • An error is showing

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #37065 (closed)

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