[avalanche] Improve the avalanche quorum functional test

Summary:
This makes the purpose of the test more explicit by starting 2 nodes with different parameters and check they behave differently according the their parameters.
The latch test is removed because it does not work with more peers and is already covered in the unit tests.

Test Plan:

./test/functional/test_runner.py abc_p2p_avalanche_quorum

Reviewers: #bitcoin_abc, sdulfari

Reviewed By: #bitcoin_abc, sdulfari

Differential Revision: https://reviews.bitcoinabc.org/D11618