fix: SetErr on Cmd if the command cannot be queued correctly in multi/exec #3509
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Fixes #2871
Two separate issues:
The first one reported by @AvyChanna was related to first error which was not supposed to be retried, especially if it is a client error before being able to get a connection, to not be assigned to the commands.
The second one, reported by @tptodorov, was related to TxPipeline which was ignoring errors when queueing commands.