Hide delete button for All branches

Jacques Erasmusrequested to merge
519136-hide-delete-btn-all-branches into master

What does this MR do and why?

Hides the delete button when the target is All branches

References

Screenshots or screen recordings

Before After
Screenshot_2025-05-12_at_02.17.25 Screenshot_2025-05-12_at_02.17.37

How to set up and validate locally

  1. Navigate to Project > Settings > Repository > Branch rules
  2. Click on All branches branch rule
  3. The delete button should not display

MR acceptance checklist

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Related to #519136 (closed)

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