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What does this MR do?

This improves branch filter dropdown results for repositories that have many (hundreds) of branches, especially with branch naming conventions like 1234-feature-x-develop which was branched from the develop branch. In some cases searching a branch dropdown for develop would not return the develop in the dropdown list due to list limit and the large number of matches sorted by name.

1111-develop
2222-develop
...
bugfix-develop

What this MR does is improve the branch filter ordering so that more relevant results are first:

1. List exact matches first
2. Previous matching behavior
3. Added support for begins_with matching (ex. ^develop)
4. Added support for ends_with matching (ex. develop$)

So a search for develop returns:

develop
1111-develop
2222-develop
...
bugfix-develop

And a search for ^develop returns:

develop
develop-7777
develop-8888
...

And a search for -develop$ returns:

1111-develop
2222-develop
3333-develop
...

What are the relevant issue numbers?

Solves #32063 (closed) Solves #41575 (closed)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides