refactor: Drop boost::this_thread::interruption_point and boost::thread_interrupted in main thread

Summary: This is a backport of Core PR14480

Test Plan:

make check
./test/functional/test_runner.py

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D4608