[net processing] Move ProcessOrphanTx to PeerManager

Summary:
Partial backport (6/9) of core PR19791:
https://github.com/bitcoin/bitcoin/pull/19791/commits/e662e2d42afaf9c67c898634a0f3bc200255b6ea

Depends on D9043.

Test Plan:

ninja all check-all

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D9044