Remove webhook check from created_ticket endpoint

As part of our project, mainline build failures will no longer cause a Jira ticket to be created for them automatically. We’ve changed the subscription type of mainline build failures in mongodb_.* projects from creating a Jira ticket to instead calling an endpoint we’ve created. This means that those tasks will no longer have a ticket filed for them automatically by Evergreen. Our endpoint creates a new “ticket” in our system. We’re now trying to put a link to that new “ticket” on the Evergreen task that failed.

We would like to use the created_ticket endpoint as it would put the link in the same place as the old Jira BFG link used to be. This would require the endpoint to no longer require a webhook to be configured in the BB plugin settings.