> Setup and shutdown code now moved into dedicated methods. Test "success" is added as a BitcoinTestFramework member, which can be accessed outside of main.
> Argument parsing also moved into separate method and called from main.
In our codebase, `set_test_params()` is called in `main()` rather than in `__init__` because we want parser options to be available during test setup (D1974).
This is a backport of Core [[https://github.com/bitcoin/bitcoin/pull/17288 | PR17288]] [2/7]
https://github.com/bitcoin/bitcoin/pull/17288/commits/6b71241291a184c9ee197bf5f0c7e1414417a0a0