Test with no --extensions-dir

[roblourens]

No description provided.

[codecov-commenter]

Codecov Report

Merging #12099 (41706ed) into main (3bbfebc) will decrease coverage by 13%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##            main   #12099     +/-   ##
========================================
- Coverage     60%      47%    -14%     
========================================
  Files        498      497      -1     
  Lines      35708    35813    +105     
  Branches    5791     5493    -298     
========================================
- Hits       21774    17006   -4768     
- Misses     11929    17302   +5373     
+ Partials    2005     1505    -500     

Impacted Files	Coverage Δ
src/kernels/kernelController.ts	16% <0%> (-84%)	⬇️
src/notebooks/export/exportToPythonPlain.ts	21% <0%> (-66%)	⬇️
src/standalone/api/kernelApi.ts	9% <0%> (-65%)	⬇️
src/platform/webviews/webviewPanelProvider.ts	12% <0%> (-64%)	⬇️
src/kernels/common/kernelSocketWrapper.ts	7% <0%> (-64%)	⬇️
...views/extension-side/variablesView/variableView.ts	17% <0%> (-64%)	⬇️
...-side/variablesView/variableViewMessageListener.ts	12% <0%> (-63%)	⬇️
src/interactive-window/helpers.ts	40% <0%> (-60%)	⬇️
src/platform/webviews/webview.ts	14% <0%> (-60%)	⬇️
...ws/extension-side/variablesView/notebookWatcher.ts	34% <0%> (-60%)	⬇️
... and 263 more