Add version column to the Agent listing

What does this MR do and why?

This MR adds a new column for the Agent listing page showing the Agent version. There are 3 warning states possible for the version column:

1. Agent version is different among pods.
2. Agent version is more than 1 minor version different from the GitLab version
3. Combination of both.

For the warning states, we show the icon near the version and the popover with the link to our docs.

Screenshots or screen recordings

Agent version is supported:

Agent version is different among pods:

Agent version is outdated:

Agent version is different among pods and outdated:

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Go to Infrastructure -> Kubernetes clusters and create a new agent.
2. Install the agent to the server using the command generated during installation. (I usually use minikube for local testing)

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.

Related to #340882 (closed)