WithFilerClient callers run their RPCs on context.Background(), so a filer
whose transport stalls without refusing (stopped peer, black-holed
connection) blocks the call forever and the walk never reaches the
remaining filer addresses. Run each attempt under a timeout; on expiry
drop the cached channel so the abandoned call is unblocked and the next
address is tried.
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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>