[backport#16557] [wallet] restore coinbase and confirmed/conflicted checks in SubmitMemoryPoolAndRelay()

Summary:
[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

Backport of Core PR16557

Test Plan:

ninja check check-functional

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D7043