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refactor(group): remove AddGroupUsers handler + authz entry

The AddGroupUsers RPC was removed from proton in raystack/proton#488.
With the SDK fully off this RPC since #1609 and the handler now just a
thin loop over SetGroupMemberRole, drop the handler, its test, and the
authorization-interceptor entry. Regenerated proto stubs reflect the
removal.

PROTON_COMMIT bumped to the proton branch SHA; will be re-pinned to the
merge commit once that PR lands.

RemoveGroupUser stays — no replacement RPC for group member removal.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>