K8s dashboard UX improvements

What does this MR do and why?

This MR fixes some UX issues on the Kubernetes dashboard pages:

1. Drawer size
2. Table styles
3. Table columns width
4. Table empty 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. Enable the k8s_dashboard feature flag

      Feature.enable(:k8s_dashboard)

1. Enable KAS on your GDK (steps 1-2 from the guide).

2. Visit the Project -> Operate -> Kubernetes clusters page and create an agent following the instruction from the modal.

   • Select the "Connect a cluster" button
   • The modal should pop up
   • In the modal select "Select an agent or enter a name to create new"
   • You probably won't have any configured agents to show up in the list, create a new one by typing the name of your choice
   • The button should appear at the bottom of the list saying "Create agent: <your-agent-name>"
   • Select the button and click "Register" in the next view.
   • Save the token to use it in the next point.

3. Add the following configuration inside your project in .gitlab/agents/<your-agent-name>/config.yaml for the user_access agent:

   gitops:
     manifest_projects:
     - id: <your-group>/<your-project>
   user_access:
     access_as: 
       agent: {}
     projects:
     - id: <your-group>/<your-project-to-share-agent-with>

4. Note that the shared agents should be connected to the cluster in order to appear in the list. Please follow points 3-8 from the guide and then the Deploy the GitLab Agent (agentk) with k3d section to create a local cluster and connect your agent with the cluster.

5. Navigate to https://gdk.test:3443/-/kubernetes/<your-agent-id>/pods

6. Verify the pages, data, and the drawer appearing on the table row click.

Related to #434197 (closed)