[tests] Change feature_csv_activation.py to use BitcoinTestFramework

Summary:
Partial backport of core PR11817 (commit 1298268)
https://github.com/bitcoin/bitcoin/pull/11817/commits/12982682a602ee656ce74b5733747a05d70907f8

Depends on D3560

Test Plan:

./test/functional/test_runner.py feature_csv_activation

Reviewers: #bitcoin_abc, deadalnix, markblundeberg

Reviewed By: #bitcoin_abc, markblundeberg

Maniphest Tasks: T669

Differential Revision: https://reviews.bitcoinabc.org/D3561