Remove JUPYTER_IMAGE env variable from notebook container

[DaoDaoNoCode]

JIRA: RHOAIENG-13602

Description

Simply remove the env variable from the codebase as mentioned.

How Has This Been Tested?

Try to create a workbench, and make sure it can successfully run.

Test Impact

N/A, just modified the mock data based on the change.

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]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (main@23c82ac). Learn more about missing BASE report.
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3407   +/-   ##
=======================================
  Coverage        ?   85.89%           
=======================================
  Files           ?     1338           
  Lines           ?    30127           
  Branches        ?     8274           
=======================================
  Hits            ?    25877           
  Misses          ?     4250           
  Partials        ?        0           

Files with missing lines	Coverage Δ
frontend/src/api/k8s/notebooks.ts	96.87% <ø> (ø)

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[andrewballantyne]

/hold

IDE conversations are happening