[validation] return txids of other transactions whose fees were used

Summary:
Partial backport of core#26646:
https://github.com/bitcoin/bitcoin/pull/26646/commits/d6c7b78ef2924af72f677ce2a7472c2447141e18

Depends on D16396.

Test Plan:

ninja all check-all

Reviewers: #bitcoin_abc, roqqit

Reviewed By: roqqit

Differential Revision: https://reviews.bitcoinabc.org/D16397