Change security discovery feedback icon to button

What does this MR do and why?

As a quick test, we should update this CTA from a smile face to a visible CTA like "Send Feedback" or something similar to see if it increases the click rate and increase the amount of feedback we receive on the issue.

Screenshots or screen recordings

Before:	After:

How to set up and validate locally

Go to any project -> Security & Compliance -> Discover

Related to #323479 (closed)