branch-4.1: [fix](topn) Handle empty rowid fetch RPC failures #66443 - #66522
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Problem Summary: TopN lazy materialization sends reusable rowid-fetch RPC requests to every target backend. A backend request can contain no row IDs for a batch, but a transport failure for that no-op request previously aborted the query. If such a failure left no response blocks, response merging could also read a missing or stale response. Ignore transport failures only when the request has no rows, clear reused responses before dispatch, and skip deserialization for empty per-relation requests. Requests containing rows and all backend-reported errors still fail. ### Release note Fix TopN lazy materialization queries that fail when an empty rowid-fetch RPC encounters a transport error.
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Cherry-picked from #66443