Make nb metadata available to jupyter startup and kernel selection layers

[DonJayamanne]

For #8612
Make nb metadata available for code starting the notebook and selecting kernel.
This is required to ensure we select an existing kernel from the notebook metadata.

[codecov-io]

Codecov Report

Merging #8784 into master will increase coverage by 0.58%.
The diff coverage is 77.77%.

@@            Coverage Diff             @@
##           master    #8784      +/-   ##
==========================================
+ Coverage    58.1%   58.68%   +0.58%     
==========================================
  Files         527      526       -1     
  Lines       27075    27172      +97     
  Branches     4043     4044       +1     
==========================================
+ Hits        15731    15945     +214     
+ Misses      10485    10356     -129     
- Partials      859      871      +12

Impacted Files	Coverage Δ
src/client/datascience/types.ts	100% <ø> (ø)	⬆️
src/client/datascience/jupyter/notebookStarter.ts	70.43% <100%> (ø)	⬆️
...ient/datascience/interactive-ipynb/nativeEditor.ts	62.66% <100%> (+0.2%)	⬆️
src/client/datascience/jupyter/jupyterExecution.ts	55.26% <60%> (-0.08%)	⬇️
src/client/interpreter/locators/helpers.ts	68.08% <0%> (-3.03%)	⬇️
...interpreter/locators/services/KnownPathsService.ts	50.94% <0%> (-2.91%)	⬇️
src/client/workspaceSymbols/parser.ts	92.37% <0%> (-0.79%)	⬇️
src/client/common/editor.ts	8.41% <0%> (-0.41%)	⬇️
src/client/common/utils/localize.ts	93.94% <0%> (-0.28%)	⬇️
src/client/providers/jediProxy.ts	23.19% <0%> (-0.16%)	⬇️
... and 29 more

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