* #1320 Update pytest configuration and tests cleanup
This commit modifies the pytest's configuration file, `pyproject.toml`, to remove filterwarnings settings. It also makes changes in various test files; the Redis isolation test is now using the provided `redis_storage` fixture instead of setting up its own connection, pytest.mark.filterwarnings is no longer used in `test_isolation.py` and `test_aiohttp_session.py` properly closes off sessions.
* Added changelog
* Fixed coverage for the RedisEventIsolation
