Don't look for a jupyter interpreter when creating blank notebook

[rchiodo]

For #8481

Also fixed #8594 as that was broken by a previous checkin for this milestone.

[codecov-io]

Codecov Report

Merging #8596 into master will increase coverage by 0.44%.
The diff coverage is 78.57%.

@@            Coverage Diff            @@
##           master   #8596      +/-   ##
=========================================
+ Coverage   59.05%   59.5%   +0.44%     
=========================================
  Files         512     512              
  Lines       23762   23766       +4     
  Branches     3838    3845       +7     
=========================================
+ Hits        14033   14141     +108     
+ Misses       8799    8706      -93     
+ Partials      930     919      -11

Impacted Files	Coverage Δ
...ient/datascience/interactive-ipynb/nativeEditor.ts	61.6% <78.57%> (+4.55%)	⬆️
src/client/datascience/constants.ts	100% <0%> (+0.33%)	⬆️
src/client/common/installer/productInstaller.ts	77.24% <0%> (+0.52%)	⬆️
src/client/common/process/proc.ts	14.84% <0%> (+1.56%)	⬆️
src/client/interpreter/locators/helpers.ts	73.17% <0%> (+2.43%)	⬆️
src/client/language/characters.ts	33.33% <0%> (+2.56%)	⬆️
src/client/linters/pylint.ts	98.18% <0%> (+3.63%)	⬆️
src/client/common/utils/version.ts	81.48% <0%> (+3.7%)	⬆️
src/client/datascience/debugLocationTracker.ts	83.01% <0%> (+3.77%)	⬆️
... and 13 more

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