[wallet] Restore confirmed/conflicted tx check in SubmitMemoryPoolAndRelay() (John Newbery)
[wallet] restore coinbase check in SubmitMemoryPoolAndRelay() (John Newbery)
Pull request description:
These checks don't change mempool acceptance/relay behaviour, but reduce log spam.
https://github.com/bitcoin/bitcoin/pull/16557/files
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Backport of Core PR16557