Check if the destroy_fork_network_on_archive feature flag is needed

Background

While investigating Projects end up broken after archiving an ancient fork parent issue, we put back the FF to remediate the affect of the incident immediately.

Tasks

• Check if the destroy_fork_network_on_archive feature flag is still needed.

Expected outcome

If we need it, we should put it back. If we don't, we should cleanup the FF. It's still enabled in prod, even though we don't have it.

/chatops run feature get destroy_fork_network_on_archive
Enabled Globally
true

Sources:

1. Follow up on the missing pool repository after archving incident
2. The issue
3. Related issue
4. Related MR <<- this might explain why the link was broken.