Remove overriding CSS styles on Admin Audit Logs table

What does this MR do?

For the initial creation of the Admin Audit Logs table Vue app, we had to apply some overrides due to conflicts with GitLab UI and GitLab CSS.

This has now been fixed in !30903 (merged). Which gives me the pleasure of doing some tech debt tidy up 😄

Screenshots

Before	After

Does this MR meet the acceptance criteria?

Conformity

• Code review guidelines
• Style guides
• Separation of EE specific content