[refactor] Rename test file to allow any getpeerinfo deprecations.
Summary:
Simple rename/restructure to allow for upcoming test additions.
This is a backport of core#19725 [3/5]
https://github.com/bitcoin/bitcoin/pull/19725/commits/df091b9b509f0b10e4315c0bfa2da0cc0c31c22f
Depends on D10372
Test Plan: ninja check-functional
Reviewers: #bitcoin_abc, Fabien
Reviewed By: #bitcoin_abc, Fabien
Subscribers: Fabien
Differential Revision: https://reviews.bitcoinabc.org/D10373