Issue Summary:

Add a global custom button to the Opsgenie alert UI, enabling actions on external systems like ServiceNow, Terraform and so on for all teams and integrations.

Steps to Reproduce:

Step 1: 

Navigate to the Opsgenie alert interface and locate the existing triple-dot button with options like "Assign" and "Escalate to Next".

Step 2: 

Attempt to configure a custom action that applies globally across all teams and integrations.

Expected Results: 

Users should be able to configure a global custom button that performs actions on external systems, such as creating or updating a ServiceNow ticket, directly from the Opsgenie alert interface.

Actual Results: 

Currently, custom actions must be configured individually for each integration, with no option for a global configuration.

Workaround: 

Currently, there is no known workaround.