Shell cmd should load executables from venv folder

[DonJayamanne]

Fixes #9089

[codecov-commenter]

Codecov Report

Merging #9090 (e55d79e) into main (69e7bf7) will decrease coverage by 0%.
The diff coverage is 89%.

@@          Coverage Diff          @@
##            main   #9090   +/-   ##
=====================================
- Coverage     71%     71%   -1%     
=====================================
  Files        382     382           
  Lines      24681   24692   +11     
  Branches    4001    4004    +3     
=====================================
- Hits       17574   17565    -9     
+ Misses      5517    5516    -1     
- Partials    1590    1611   +21     

Impacted Files	Coverage Δ
src/client/common/variables/types.ts	100% <ø> (ø)
...atascience/kernel-launcher/kernelEnvVarsService.ts	75% <66%> (-1%)	⬇️
...atascience/jupyter/kernels/jupyterKernelService.ts	79% <80%> (-1%)	⬇️
src/client/common/variables/environment.ts	96% <100%> (+<1%)	⬆️
...ience/variablesView/variableViewMessageListener.ts	77% <0%> (-23%)	⬇️
...ent/common/application/webviewViews/webviewView.ts	67% <0%> (-11%)	⬇️
...ent/datascience/jupyter/kernels/kernelExecution.ts	67% <0%> (-6%)	⬇️
.../client/datascience/debugLocationTrackerFactory.ts	92% <0%> (-4%)	⬇️
src/client/common/application/webviews/webview.ts	73% <0%> (-2%)	⬇️
...ience/kernel-launcher/localKernelSpecFinderBase.ts	76% <0%> (-2%)	⬇️
... and 17 more