Display instructions to install ipykernel in cell output

[DonJayamanne]

For #8327

[codecov-commenter]

Codecov Report

Merging #8328 (86e9213) into main (402f1fa) will increase coverage by 0%.
The diff coverage is 18%.

@@          Coverage Diff           @@
##            main   #8328    +/-   ##
======================================
  Coverage     71%     72%            
======================================
  Files        373     373            
  Lines      23323   23373    +50     
  Branches    3570    3589    +19     
======================================
+ Hits       16657   16845   +188     
+ Misses      5214    5078   -136     
+ Partials    1452    1450     -2     

Impacted Files	Coverage Δ
...er/jupyterInterpreterSubCommandExecutionService.ts	91% <0%> (ø)
src/client/datascience/types.ts	100% <ø> (ø)
src/client/datascience/errors/errorHandler.ts	57% <11%> (-13%)	⬇️
src/client/common/installer/productInstaller.ts	62% <100%> (ø)
src/client/common/utils/localize.ts	95% <100%> (+<1%)	⬆️
...e/jupyter/interpreter/jupyterInterpreterService.ts	89% <100%> (+<1%)	⬆️
...lient/datascience/jupyter/kernels/cellExecution.ts	73% <0%> (-1%)	⬇️
src/client/debugger/jupyter/kernelDebugAdapter.ts	82% <0%> (+<1%)	⬆️
...datascience/jupyter/liveshare/hostJupyterServer.ts	61% <0%> (+<1%)	⬆️
src/client/datascience/jupyter/kernels/kernel.ts	77% <0%> (+<1%)	⬆️
... and 30 more