API integrations don't support "Custom Value to Opsgenie Priority" but the new UI offers the option

Issue Summary

Action filters for API-based integrations in the new UI do offer the option to set a "custom priority" but this option is not supported for this kind of integrations.

Steps to Reproduce

Edit a filter alert under an API-based integration.

Expected Results

The option to customize the priority should not appear for API-based integrations.

Actual Results

Workaround

We have a Community article that provides steps to map alert priorities.