fix return type when creating dashboard config

[christianvogt]

https://issues.redhat.com/browse/RHOAIENG-15388

Description

Fixes error Cannot read properties of undefined (reading 'notebookController')

The resourceUtils.ts#createDashboardCR function returned an array instead of the dashboard config itself, therefore when attempting to read spec.notebookController from the config, it would fail since spec is undefined on the array. At the same time, also returned the blankDashboardCR in case creation were to fail.

This points to a bigger issue where our tsconfig needs to be made strict.

How Has This Been Tested?

• Spin down the dashboard deployment or stop your local backend server.
• Delete the OdhDashboardConfig
• Start the dashboard backend
• Immediately hit the frontend URL.
• Page should load without error.

Test Impact

Request review criteria:

Self checklist (all need to be checked):

• The developer has manually tested the changes and verified that the changes work
• 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.

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

[openshift-ci]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.15%. Comparing base (4260e3e) to head (197c3fd).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3598      +/-   ##
==========================================
- Coverage   85.17%   85.15%   -0.03%     
==========================================
  Files        1393     1393              
  Lines       31942    31942              
  Branches     8958     8958              
==========================================
- Hits        27208    27201       -7     
- Misses       4734     4741       +7     

see 3 files with indirect coverage changes

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