Nudge users to re-enable prebuilds if webhook has been disabled for GitLab projects

[gtsiolis]

Problem to solve

GitLab automatically disabled prebuilds when the webhook is failing intermittently and is temporarily disabled.

See relevant docs about failing webhooks from GitLab:

If a webhook fails repeatedly, it may be disabled automatically.

If the hook continues to fail, the back-off period is extended on each retry, up to a maximum disabled period of 24 hours.

See relevant discussion (internal).

Proposal

Nudge users to re-enable prebuilds if webhook has been disabled for GitLab projects.

This could probably be resolved with an alert component at the top of the prebuilds list like the proposal in #9232 when prebuild are paused.

TBD (To be discussed)

[AlexTugarev]

I created #13985 to tackle the failing webhooks.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.