Move vRecvGetData to net processing
Summary:
This is a backport of core#19911 [3/7]
https://github.com/bitcoin/bitcoin/pull/19911/commits/2d9f2fca43aadcdda4d644cddab36dca88b40b97
Depends on D10528
Test Plan: ninja all check-all
Reviewers: #bitcoin_abc, Fabien
Reviewed By: #bitcoin_abc, Fabien
Differential Revision: https://reviews.bitcoinabc.org/D10529