Add exclude_patterns to FindLocalBranches RPC

Vasilii Iakliushinrequested to merge
600332-find-local-branches-exclude-patterns into master

What does this MR do and why?

Contributes to gitlab#600332 (closed)

Problem

GitLab Rails currently filters protected branches out of FindLocalBranches results on the client side. Because filtering happens after pagination, pages can come back short or report has_next_page: false while unprotected branches still exist further in the list.

Solution

Add a new exclude_patterns field to FindLocalBranchesRequest that maps to --exclude=<pattern> flags on git for-each-ref. This lets the caller exclude specific ref patterns (exact or glob) server-side, so Gitaly returns only the desired branches with correct pagination.

References

Screenshots or screen recordings

Not applicable (backend/proto change only).

How to set up and validate locally

  1. Check out this branch
  2. Run the tests: 
    go test ./internal/gitaly/service/ref/... -run TestFindLocalBranches -count=1
  3. All 54 test cases should pass (27 per feature flag variant)

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