Fix env variable input field issues on Notebook controller spawner

[DaoDaoNoCode]

JIRA: https://issues.redhat.com/browse/RHOAIENG-9502

Description

Solved 2 issues:

1. Don't show the error message when the name is initially generated or empty
2. Check the name field and disabled the submit button if the name field is initially generated or empty

How Has This Been Tested?

1. Go to Enabled page
2. Go to the notebook controller spawner page by clicking on Launch application on the Jupyter card
3. At the bottom of the page, click "Add more variables"
4. In the first item dropdown, click on the Custom variable option again (though it's selected already)
5. Make sure there is no error helper text under the name field
6. Make sure the "Start server" button is disabled
7. Try to type in the name field, make sure the "Start server" button is enabled when the name field is not empty and disabled when the name field is empty
8. Try to add more variables fields, and make sure the "Start server" button is disabled if any of the name fields is empty

Test Impact

N/A, we don't have tests for the notebook controller, not sure if it is worth the effort for this page.

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)

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• Included any necessary screenshots or gifs if it was a UI change.
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After the PR is posted & before it merges:

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[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 85.16%. Comparing base (57ce8a7) to head (67f7048).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
.../notebookController/screens/server/SpawnerPage.tsx	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3146      +/-   ##
==========================================
- Coverage   85.16%   85.16%   -0.01%     
==========================================
  Files        1251     1251              
  Lines       27384    27388       +4     
  Branches     7261     7264       +3     
==========================================
+ Hits        23322    23324       +2     
- Misses       4062     4064       +2     

Files with missing lines	Coverage Δ
...oller/screens/server/EnvironmentVariablesField.tsx	3.03% <ø> (ø)
.../notebookController/screens/server/SpawnerPage.tsx	64.55% <66.66%> (+0.27%)	⬆️

... and 5 files with indirect coverage changes

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[pnaik1]

I see unless we type the variable name the submit button is disabled, can we make variable name required??

[Gkrumbach07]

/lgtm

code looks good

[pnaik1]

/lgtm, tested locally

[Gkrumbach07]

/approve

[openshift-ci]

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