Add case insensitive branches search

What does this MR do?

Adds case-insensitive search in branches

Are there points in the code the reviewer needs to double check?

No

Why was this MR needed?

To

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• [n/a ] Documentation created/updated
• [n/a ] API support added
• Tests added for this feature/bug
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
  • Has been reviewed by Backend
  • Has been reviewed by Database
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together

What are the relevant issue numbers?

Closes #35199 (closed)