Improve Geo Nodes admin screen

This is how our Geo Nodes admin screen look like today:

There are a lot of information and concerns in a single screen:

CRUD
Monitoring
Health Checking and Error displaying
Disabling / Re-enabling replication
Repairing configuration (if some of dependencies are removed a button to repair shows up next to the Node).
Selective replication (you can choose a node to sync only specified namespaces)

We need UX work here. Few things in my mind:

We may want to hide the form and show it only when the user clicks a "Add a new Geo node" button
We need a "hero" onboarding instruction (perhaps this is what I meant: https://gitlab.com/gitlab-org/gitlab-ee/issues/1363)
There are a lot of tabular information need to rethink something
We display percentage of completude, perhaps we can show a nice progress bar or a composed progress bar with different colors for Actual / Remaining / Failed
Should we hide the extra information in a collapsable something?
How do we display more than one error?
- Where do we display then?
- Should we have a "checklist" with "green" and "red" dots for everything we are testing on behalf of our user?
How do we display / communicate selective replication?
- Should we have icons for "full" and "selective"?
- Should we display all selected namespaces, or hide it into a collapsable something? in a modal? New page?

We are not finished yet on the amount of things we want to communicate, there are this other issues on the backlog:

If there are no nodes on 'Geo Nodes' page, it will show the empty state from https://gitlab.com/gitlab-org/gitlab-ee/issues/1363.
If there are nodes on 'Geo Nodes' page, only the 'Geo nodes' table will be displayed. (Mockup 01)

The 'Add new node' form is removed from this page and displays on a separate page. (Mockup 02)

On 'New node' and 'Edit Geo Node' pages, if [] This is primary node is checked, Public key and Namespaces to replicate will be hidden.(Mockup 03)

It includes the numbers of 'Synced', 'Failed', and 'Out of sync' in the progress bar.
When the mouse is over the progress bar, a tooltip with the percentage will show up.

The selective replications aren't displayed on 'Geo Nodes' page. Considering that there might be thousands of replications, so they will only be shown in the 'edit form'.
Instead, only the status of sync setting will be displayed.

Last event info displays next to status of Selective replications.
5 minutes up to 1 hour: A tooltip with Node is slow, overloaded, or it just recovered after an outage. shows up when it's hovering.
Over 1 hour: A tooltip with Node is failing or broken. shows up when the mouse is over the text.

Up to 5 minutes	5 minutes up to 1 hour	Over 1 hour

If there is more than one error, the second error displays under the first error. Users can expand the error message if it has detail information (e.g. health checklist). (Mockup 05)