Update SAST config primary action button variant

What does this MR do and why?

Uses confirm variant instead of deprecated success

Screenshots or screen recordings

before	after

How to set up and validate locally

1. Click Security & Compliance within a project
2. Click Enable SAST
3. See primary action on bottom bar

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.

Related: #342454 (closed)