[avalanche] Check all inv types in cooldown test

Summary: Make sure avapoll cooldown behavior works correctly for all supported inv types.

Test Plan:

test_runner.py abc_p2p_avalanche_cooldown

Reviewers: O1 Bitcoin ABC, #bitcoin_abc, Fabien

Reviewed By: O1 Bitcoin ABC, #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D16813