[RHOAIENG-6985] Create kserve metrics feature flag

[jeff-phillips-18]

Closes: RHOAIENG-6985

Description

Initial creation fo the kserve metric feature, disabled by default. Includes a simple Coming soon page.

How Has This Been Tested?

Tested locally and added e2e tests

Test Impact

Verify that the user can navigate to the kserve metrics page from the model list view by clicking on the model name ONLY if the feature flag is enabled.

Screen shots

Request review criteria:

• 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)
• Included any necessary screenshots or gifs if it was a UI change.

[alexcreasy]

Overall this looks good, however I found an issue in testing.

When ModelMesh is disabled in the DSC but Kserve is enabled there are two issues:

1. There is no link to the metrics page from the data science project details route
2. Whilst there is a link from the Global model serving route, the link is broken and ends up with an infinity spinner.

This could have something to do with how the model metrics area is defined - right now it depends on modelmesh being installed, which might contribute to this issue?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.42857% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 77.45%. Comparing base (8645fe6) to head (b5648a4).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2795      +/-   ##
==========================================
+ Coverage   77.32%   77.45%   +0.12%     
==========================================
  Files        1093     1093              
  Lines       23026    23043      +17     
  Branches     5799     5808       +9     
==========================================
+ Hits        17805    17848      +43     
+ Misses       5221     5195      -26     

Files	Coverage Δ
frontend/src/concepts/areas/const.ts	100.00% <ø> (ø)
frontend/src/concepts/areas/types.ts	100.00% <100.00%> (ø)
frontend/src/k8sTypes.ts	100.00% <ø> (ø)
...erving/screens/global/InferenceServiceTableRow.tsx	96.77% <100.00%> (+0.77%)	⬆️
...Serving/screens/metrics/GlobalModelMetricsPage.tsx	100.00% <ø> (ø)
...s/modelServing/screens/metrics/MetricsPageTabs.tsx	75.00% <100.00%> (+5.76%)	⬆️
...ing/screens/metrics/performance/PerformanceTab.tsx	100.00% <100.00%> (+50.00%)	⬆️
...rving/screens/projects/ProjectModelMetricsPage.tsx	100.00% <ø> (+80.00%)	⬆️
.../serverModels/deployedModels/DeployedModelCard.tsx	92.30% <100.00%> (+0.64%)	⬆️
...pages/modelServing/screens/metrics/MetricsPage.tsx	86.66% <80.00%> (-5.00%)	⬇️

... and 6 files with indirect coverage changes

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[alexcreasy]

@jeff-phillips-18 there's just one more thing I've noticed:
For kserve there's no link on the Project -> Overview tab widget for kserve, but it works for modelmesh.

Otherwise all good!

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alexcreasy

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[alexcreasy]

/lgtm