Get rid of -Wthread-safety-precise warnings

Summary:
This is part [4/5] of Core PR18635 : https://github.com/bitcoin/bitcoin/pull/18635/commits/9cc6eb3c9e0eb1d5be26fb81cc5595c131fec8f4

Depends on D7879, D7876 and D7875

Test Plan:

ninja all check

Check that clang thread safety analysis is happy.

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D7880