ignore flaky test: test_hard_fork_with_gap_in_roots

[gregcusack]

Problem

PR #823 has caused the test: test_hard_fork_with_gap_in_roots to be flaky and the test: test_invalid_forks_persisted_on_restart to fail consistently.

Buildkite link: https://buildkite.com/organizations/anza/analytics/suites/agave/tests/018d9c52-ab10-74c0-b12d-9ebd22a1cb3a?branch=master#failed

However, @behzadnouri found that propagating ContactInfo more frequently resulted in these tests succeeding consistently. See: #823 (comment)

We should not make these changes right now for 2 reasons:

1. Switching to use ContactInfo at the end of a Pull Request will make master incompatible with mainnet. So, we need to wait for the cluster to upgrade to v1.18
2. These two tests failing as a result of slower contact info propagation is a general concern. These tests rely on contact-info propagation by a certain time which is not guaranteed. Furthermore, they're relying on propagation via the Pull path which is not ideal.

Tracking issue here: #982

Summary of Changes

ignore the test_invalid_forks_persisted_on_restart test

[behzadnouri]

lgtm, Can you please also link to the tracking issue? thanks,

[gregcusack]

lgtm, Can you please also link to the tracking issue? thanks,

oh shoot yes!