fix: fix disable button condition in launch jupyter notebook modal

[keita-determined]

Ticket

MD-360

Description

Follow up of #9109

Test Plan

• Check if launch button is enabled when all required fields are filled
• Check if launch button is disabled when one or more required fields are missing

Checklist

• Changes have been manually QA'd
• User-facing API changes need the "User-facing API Change" label.
• Release notes should be added as a separate file under docs/release-notes/.
  See Release Note for details.
• Licenses should be included for new code which was copied and/or modified from any external code.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 38.99%. Comparing base (b109108) to head (902f36f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9155      +/-   ##
==========================================
- Coverage   45.71%   38.99%   -6.72%     
==========================================
  Files        1179      857     -322     
  Lines      146790   107388   -39402     
  Branches     2419     2420       +1     
==========================================
- Hits        67104    41879   -25225     
+ Misses      79472    65295   -14177     
  Partials      214      214              

Flag	Coverage Δ
harness	?
web	35.82% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
webui/react/src/components/JupyterLabModal.tsx	84.42% <100.00%> (+0.06%)	⬆️

... and 322 files with indirect coverage changes