Update GlAlert in security dashboard table

What does this MR do and why?

A small MVC for: #353431 (closed) where we Remove reliance on Flash styling within security_dashboard_table.vue.

Screenshots or screen recordings

Before	After

How to set up and validate locally

N/A

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.