restrict shouldAllowIntellisense to only python notebook cells so tha…

[bschnurr]

…t plain .py files dont get duplicate results in api calls to onHover etc.

Fixes # microsoft/pylance-release#3027

• 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 feature-requests.
• 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).

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63%. Comparing base (12a4f20) to head (79695b2).
⚠️ Report is 1870 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff           @@
##            main   #11106   +/-   ##
======================================
- Coverage     63%      63%   -1%     
======================================
  Files        482      482           
  Lines      33839    33891   +52     
  Branches    5517     5529   +12     
======================================
+ Hits       21456    21457    +1     
- Misses     10342    10380   +38     
- Partials    2041     2054   +13     

Files with missing lines	Coverage Δ
...andalone/intellisense/intellisenseProvider.node.ts	81% <100%> (+<1%)	⬆️

... and 273 files with indirect coverage changes

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[debonte]

microsoft/pylance-release#3212