[rpc] return effective-includes in testmempoolaccept and submitpackage

Summary:
Partial backport of core#26646:
https://github.com/bitcoin/bitcoin/pull/26646/commits/601bac88cb95404e7d38ac6348d959c0e06bd922

Depends on D16398.

Using TxId instead of WTxId.

Test Plan:

ninja all check-all

Reviewers: #bitcoin_abc, roqqit

Reviewed By: roqqit

Subscribers: roqqit

Differential Revision: https://reviews.bitcoinabc.org/D16399