Remove UI for Opsgenie integration
Problem to Solve
We are replacing the minimal Opsgenie integration that exists today with our brand new HTTP endpoints. Users can easily set up an endpoint to route Opsgenie alerts to GitLab, if they want to surface them in the GitLab Alerts List!
Plan
See the detailed plan here.
Proposal
Remove the Opsgenie integration. I believe that includes the following:
Remove from Integrations drop-down
Remove config form
Remove state of Alerts list with Opsgenie integration is enabled
