Follow-up from "Expose issue iid in alert management alert graphql"

Refactor tests to make them more readable

The following discussion from !31313 (merged) should be addressed:

• @seanarnold started a discussion: (+1 comment)

  Nit: We can maybe refactor the wording in these specs in another MR as its a bit confusing that first_alert = alert_2 and second_alert = alert_1.