chore(spanner): handle commit retry protocol extension for mux rw #11472
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In a read-write transaction using a multiplexed session with (read/query + mutation) operations, the CommitResponse from the backend during the commit RPC may include a MultiplexedSessionRetry field (indicated by a precommit token). This field signals that the commit RPC should be retried once using the new precommit token. During this retry, mutations should not be resent, as they were already buffered in spanFE during the initial commit RPC call.