Now that BFG tickets are created by posting to an external server, we can remove the special casing we added to excluded stranded tasks for Jira tickets.
Original Title: Do not create BF tickets for stranded tasks
Original Description: We currently have some handling to exclude stranded tasks for jira tickets. However, with the new BFG tool the project is posting to an external server instead, which doesn't have this handling. This logic should be extended to the new flow. Additionally, it should use the subscription failure type to determine what counts as a failure worth generating a ticket for, rather than assuming all non-system failures are legitimate.