Remove jira_connect/subscriptions_controller#create action

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The #create action (along with route) in app/controllers/jira_connect/subscriptions_controller.rb can now be removed since the frontend now uses the API endpoint instead of this private one.

The following discussion from !119712 (merged) should be addressed:

• @Andysoiron started a discussion:

  Suggestion (non-blocking): I think this action can be removed too. It should be served via API here. But let's do this in a separate MR.