Add exclude_patterns to ListRefs RPC

Vasilii Iakliushinrequested to merge
600332-list-refs-exclude-patterns into master

What does this MR do and why?

Contributes to gitlab#600332 (closed)

Problem

The ListRefs RPC does not support excluding specific references from results. Callers that need a filtered subset must fetch all matching refs and exclude unwanted ones client-side, which breaks pagination correctness when many refs are excluded.

Solution

Add a new exclude_patterns field to ListRefsRequest 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 refs 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 "TestServer_ListRefs|TestListRefs_validate" -count=1
  3. All test cases should pass

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