Stop asking users to install ipykernel on autostart

[DavidKutu]

only do it when a cell is ran.

For #5368

• Pull request represents a single change (i.e. not fixing disparate/unrelated things in a single PR).
• Title summarizes what is changing.
• Has a news entry file (remember to thank yourself!).
• Appropriate comments and documentation strings in the code.
• Has sufficient logging.
• Has telemetry for enhancements.
• Unit tests & system/integration tests are added/updated.
• Test plan is updated as appropriate.
• package-lock.json has been regenerated by running npm install (if dependencies have changed).

[rchiodo]

I think createNotebookIfProviderConnectionExists should be changed to add a flag and it should only be set to true in the ctor call.

This also means in the same function the call to this.notebookProvider.connect should also pass the disable UI flag.

[codecov-io]

Codecov Report

Merging #5440 (2ae8311) into main (54bc65d) will decrease coverage by 0%.
The diff coverage is 100%.

❗ Current head 2ae8311 differs from pull request most recent head 961d913. Consider uploading reports for the commit 961d913 to get more accurate results

@@          Coverage Diff          @@
##            main   #5440   +/-   ##
=====================================
- Coverage     73%     73%   -1%     
=====================================
  Files        401     401           
  Lines      26584   26585    +1     
  Branches    3880    3882    +2     
=====================================
- Hits       19510   19509    -1     
- Misses      5459    5460    +1     
- Partials    1615    1616    +1     

Impacted Files	Coverage Δ
src/client/datascience/types.ts	100% <ø> (ø)
.../datascience/interactive-common/interactiveBase.ts	70% <100%> (ø)
...datascience/interactive-common/notebookProvider.ts	81% <100%> (ø)
...ient/datascience/interactive-ipynb/nativeEditor.ts	70% <100%> (ø)
...ient/datascience/raw-kernel/rawNotebookProvider.ts	90% <100%> (ø)
src/client/common/errors/errorUtils.ts	71% <0%> (-4%)	⬇️
...datascience/editor-integration/codelensprovider.ts	85% <0%> (-2%)	⬇️
...e/interactive-ipynb/nativeEditorCommandListener.ts	44% <0%> (-2%)	⬇️
src/client/datascience/baseJupyterSession.ts	75% <0%> (-1%)	⬇️
...ient/datascience/editor-integration/codewatcher.ts	69% <0%> (-1%)	⬇️
... and 4 more