feat(mr): routes etc and empty state for registered deployments

[gitdallas]

initial progress towards https://issues.redhat.com/browse/RHOAIENG-6636

Description

includes setting up the tab, routes, and the component with the empty state

How Has This Been Tested?

na, just setting up a skeleton with empty state for now

Test Impact

none

Request review criteria:

can access tab with route and see empty state

Self checklist (all need to be checked):

• The developer has manually tested the changes and verified that the changes work
• Commits have been squashed into descriptive, self-contained units of work (e.g. 'WIP' and 'Implements feedback' style messages have been removed)
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has added tests or explained why testing cannot be added (unit or cypress tests for related changes)

If you have UI changes:

• Included any necessary screenshots or gifs if it was a UI change.
• Included tags to the UX team if it was a UI/UX change (find relevant UX in the SMEs section).

After the PR is posted & before it merges:

• The developer has tested their solution on a cluster by using the image produced by the PR to main

[lucferbux]

Just one small nit regarding data fetching, rest looks ok!

[lucferbux]

/lgtm

Good first PR to add scaffolding

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lucferbux

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[lucferbux]

oh @gitdallas we got some conflicts after the latest merges.

[openshift-ci]

New changes are detected. LGTM label has been removed.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 45.45455% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 77.63%. Comparing base (93c0851) to head (e80751a).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2793      +/-   ##
==========================================
+ Coverage   77.61%   77.63%   +0.02%     
==========================================
  Files        1075     1076       +1     
  Lines       22604    22611       +7     
  Branches     5713     5715       +2     
==========================================
+ Hits        17545    17555      +10     
+ Misses       5059     5056       -3     

Files	Coverage Δ
...nd/src/pages/modelRegistry/ModelRegistryRoutes.tsx	66.66% <ø> (ø)
.../modelRegistry/screens/EmptyModelRegistryState.tsx	92.85% <100.00%> (+1.19%)	⬆️
...nDetails/ModelVersionRegisteredDeploymentsView.tsx	33.33% <33.33%> (ø)
...ns/ModelVersionDetails/ModelVersionDetailsTabs.tsx	12.50% <0.00%> (-4.17%)	⬇️

... and 4 files with indirect coverage changes

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