feat(amazonq): env var change for JupyterLab conversation history on refresh support

[ruotingx]

Description
Team has decided to use SAGEMAKER_APP_TYPE_LOWERCASE env var to support conversation history on refresh for JupterLab.

Testing Done

• npm test
• Build server bundle and tested in a SMUS space

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[Will-ShaoHua]

nit: localize jupyterlab somewhere in case of typo

[ruotingx]

Done

[codecov-commenter]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 61.85%. Comparing base (4ce9d8f) to head (1eee974).

Files with missing lines	Patch %	Lines
...rc/language-server/agenticChat/tabBarController.ts	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2395      +/-   ##
==========================================
- Coverage   61.87%   61.85%   -0.02%     
==========================================
  Files         261      261              
  Lines       58504    58505       +1     
  Branches     3672     3669       -3     
==========================================
- Hits        36198    36189       -9     
- Misses      22235    22245      +10     
  Partials       71       71              

Flag	Coverage Δ
unittests	61.85% <66.66%> (-0.02%)	⬇️

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