[On Demand DAST Scan] Rescue RecordNotUnique exception

What does this MR do and why?

Rescue RecordNotUnique exception silently

The exception is rescued silently since it is possible the association between DAST Profile ID and CI Pipeline ID was already created.

Relevant Issue: #421684 (closed)

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.