Merge smarter jupyter values

[andrewballantyne]

https://issues.redhat.com/browse/RHOAIENG-7070

Description

Improves the merging of env values provided as part of the Jupyter Tile.

How Has This Been Tested?

1. Don't have a Jupyter Tile Notebook
   • delete Notebook, PVC, and configmap under your name
   • Find the namespace these are in by checking the OdhDashboardConfig -- if a notebookNamespace is set, go there, if not it's in the Dashboard's namespace
2. Create a Jupyter Tile Notebook
3. Stop the Notebook after it creates (this flow is not part of this fix)
4. Add an env var and start the Notebook again

It failed after the 2nd start (no4 above) with an error in the modal -- if it continues to deploy, the fix is successful.

Test Impact

Wrote tests for the customizer function used in lodash mergeWith

Request review criteria:

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

[christianvogt]

/lgtm
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: christianvogt, gitdallas

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[codecov-commenter]

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Additional details and impacted files

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[harshad16]

Tested this on my cluster:

1. Work well for the addition of env var
2. Has issues in subtraction.
   Error: couldn't find key en1 in ConfigMap redhat-ods-applications/jupyterhub-singleuser-profile-hnalla-40redhat-2ecom-envs
   

/hold

[harshad16]

The Changes works for both addition and substraction 💯
/lgtm