Functional tests for native interactive window

[joyceerhl]

For #6516

[codecov-commenter]

Codecov Report

Merging #6786 (053d53d) into main (661ee81) will increase coverage by 0%.
The diff coverage is 65%.

@@          Coverage Diff           @@
##            main   #6786    +/-   ##
======================================
  Coverage     65%     66%            
======================================
  Files        361     361            
  Lines      22554   22564    +10     
  Branches    3410    3417     +7     
======================================
+ Hits       14806   15020   +214     
+ Misses      6452    6229   -223     
- Partials    1296    1315    +19     

Impacted Files	Coverage Δ
src/client/datascience/types.ts	100% <ø> (ø)
...datascience/editor-integration/cellhashprovider.ts	67% <33%> (+<1%)	⬆️
...ractive-window/interactiveWindowCommandListener.ts	28% <50%> (ø)
...atascience/interactive-window/interactiveWindow.ts	50% <66%> (ø)
.../datascience/editor-integration/codeLensFactory.ts	70% <100%> (+13%)	⬆️
...nt/datascience/editor-integration/hoverProvider.ts	52% <100%> (+7%)	⬆️
...ce/interactive-window/interactiveWindowProvider.ts	72% <100%> (ø)
src/client/datascience/serviceRegistry.ts	98% <100%> (ø)
...client/datascience/kernel-launcher/kernelDaemon.ts	53% <0%> (-2%)	⬇️
...lient/datascience/variablesView/notebookWatcher.ts	83% <0%> (-2%)	⬇️
... and 31 more

[joyceerhl]

I have more tests I want to add to this file, but I'd like to check this initial set in first. These tests have already caught some bugs.