Fixes for debugging Web Tests

[DonJayamanne]

Debugging web tests was broken, simple fix

[codecov-commenter]

Codecov Report

Merging #10503 (c3bae02) into main (b821681) will decrease coverage by 0%.
The diff coverage is n/a.

@@          Coverage Diff           @@
##            main   #10503   +/-   ##
======================================
- Coverage     71%      70%   -1%     
======================================
  Files        467      467           
  Lines      28073    28073           
  Branches    4736     4736           
======================================
- Hits       19944    19927   -17     
- Misses      6239     6258   +19     
+ Partials    1890     1888    -2     

Impacted Files	Coverage Δ
src/kernels/execution/cellExecution.ts	71% <0%> (-9%)	⬇️
src/kernels/execution/cellExecutionQueue.ts	81% <0%> (-2%)	⬇️
src/kernels/variables/kernelVariables.ts	56% <0%> (-2%)	⬇️
...ctive-window/editor-integration/codeLensFactory.ts	88% <0%> (-1%)	⬇️
src/notebooks/outputs/tracebackFormatter.ts	100% <0%> (+6%)	⬆️