Update resolve vulnerability to return MR link

What does this MR do and why?

Update the response to return the MR link instead of the MR reference. This will allow the FE to directly use the response to redirect the user to the link from the response without any further data transformation.

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Before	This MR

How to set up and validate locally

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

MR acceptance checklist

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

Relates to #432797 (closed)