Agent status page: Update icons list in the agent list

What does this MR do and why?

The MR updates the agent status icons to be consistent with the new design of the agent status page. It also fixes the spacing across the table to reflect the design.

Note: the warning status is not implemented yet.

Screenshots or screen recordings

Before	After

Design:

How to set up and validate locally

1. Visit Infrastructure -> Kubernetes clusters page
2. Select Connect cluster and proceed through the steps required by the modal
3. Follow the instructions generated at the final step to get an agent in active state
4. Remove the installed agent from the cluster or the agent's token to get an agent in inactive status
5. Just close the modal to get an agent in unused state

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.

Review progress:

• UX review
• frontend developer review
• frontend maintainer review

Related to #363735 (closed)