Fix layout issues on notebook controller

[DaoDaoNoCode]

JIRA: RHOAIENG-1202

Description

Remove the div on the administration page to make it use the full width:

Fix the loading state by adding the loadingContent to the applications page to remove the background.

How Has This Been Tested?

Go to the notebook controller page and switch between the Notebook Server and Administration tab. See how the loading state renders, Make sure there is no layout issue.

Test Impact

N/A, layout fix.

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

[pnaik1]

/retest

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.85%. Comparing base (47aabd3) to head (d347f01).
Report is 10 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3258   +/-   ##
=======================================
  Coverage   84.84%   84.85%           
=======================================
  Files        1299     1299           
  Lines       28920    28920           
  Branches     7771     7771           
=======================================
+ Hits        24538    24540    +2     
+ Misses       4382     4380    -2     

Files with missing lines	Coverage Δ
...kController/screens/admin/NotebookAdminControl.tsx	100.00% <100.00%> (ø)
.../notebookController/screens/server/SpawnerPage.tsx	64.55% <ø> (ø)

... and 6 files with indirect coverage changes

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[pnaik1]

Verified on a cluster
there is no layout issue.
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Gkrumbach07

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• frontend/OWNERS [Gkrumbach07]

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