Draft: Migrate utility classes and css variables for activity

What does this MR do and why?

• Migrate utility classes
• Migrate to color tokens
• Fix "close issue" icon
• Align icon with the text

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. http://gdk.test:3000/users/root/activity
2. http://gdk.test:3000/dashboard/activity

#452231 (closed)