Resolve "Fix the color of the visibility icon on project lists"

What does this MR do?

Using CSS classes for icon colors so we avoid the CSS noise 😄

Screenshots

Before	After

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Performance and testing

• Tested in all supported browsers

Closes #64700 (closed)