Revamp empty state in Model Serving Global

[lucferbux]

Description

Closes #1091

How Has This Been Tested?

1. Delete all Model Servers in all projects
2. Navigate to the Model Serving global page
3. Check that the empty state is changed

Test Impact

Added coverage for empty state

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[lucferbux]

@kaedward this is the end result:

I went with a small EmptyState variant to avoid having a one liner description.

I only have one question here, the link variant for button removes the padding that was in place for the primary button, making the button to be closer to the body. Should we add some layout here or should we keep it as it is?

[lucferbux]

I've just created this to open a conversation, I think @andrewballantyne mentioned this a few weeks ago, but I couldn't find any logged issue, should we include this util method to keep the navigation more consistent?

[kaedward]

@lucferbux here's some updated text for this empty state:

"No deployed models yet
To get started, deploy a model from the Models and model servers section of a project.
[Select a project]"

As for the layout questions, I'm not sure - maybe @vconzola would have an opinion :-)

[andrewballantyne]

@lucferbux please recreate your PR, I have reverted this in #1834