[CAL-5200] Prevent duplicate submissions in Routing Form.

[hariombalhara]

Things to think about:

• How does one determine if it is exact duplicate from the same person?
  • Can we assume that if email field is there, then only we implement this. Otherwise, it could be that same reponse could be from some other person?
• For how long should we consider a duplicate a duplicate?
  • If a person submits the exact same response after a month, would it still be considered a duplicate?
• What should happen if the duplicate is submitted?
  • Should we error? - Easiest
  • Should we route to the booking success page if corresponding booking has been submitted already? Makes the most sense.
    • We could show some toast e.g. that mentions that you have been taken to already submitted booking's page.
  • What if the route's action was to redirect to an external page or show custom message?
    • I think it just makes sense to repeat the redirect or show custom message again.

_{From SyncLinear.com | CAL-5200}