Fix creating epic in scoped epic board

What does this MR do and why?

Fixes creating an epic in a scoped epic board. Now when a label is defined in board scope, it adds it automatically to the epic being created.

Screenshots or screen recordings

Before After
Create_epic_in_board_-_before Create_epic_in_board_-_after

How to set up and validate locally

  1. Visit an epic board
  2. Click Edit board in the top right corner
  3. Add a label to scope and Save
  4. In a board column click + and create an epic
  5. The epic should have the label from scope assigned

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 #363430 (closed)

Edited by Florie Guibert

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