MOVEONLY: context-free package policies

Summary:
Co-authored-by: ariard <antoine.riard@gmail.com>

This concludes backport of core#22084
https://github.com/bitcoin/bitcoin/pull/22084/commits/ee862d6efb4c3c01e55f0d5d7a82cce75323cf40

Depends on D12134

Test Plan: ninja all check-all

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D12135