Remove INotebook interface

[DonJayamanne]

Part of #8933

The INotebookProvider will remain for now, this is just step 1 of refactoring to remove/refactor some of the old code related to live share.
Note: INotebook had two properties & one of the was IJupyterSesion & the other connection, & connection was never used, hence INotebook interface was completely unnecessary, we could have just one property session or remote it all together - went with the latter.

I don't want to rename INotebookProvider to ISessionProvider as we already have a interface named ISessionManager & both have create functions.

The Notebook provider does a few things that we an split, e.g. starting of Jupyter for local non-raw cases, or it can be done by other means, either way, that can be done seprately (and a few more changes to simplify things).

TLDR - this only focuses on removing INotebook

[codecov-commenter]

Codecov Report

Merging #9878 (9c8fac9) into main (131f6c3) will increase coverage by 0%.
The diff coverage is n/a.

❗ Current head 9c8fac9 differs from pull request most recent head f53447c. Consider uploading reports for the commit f53447c to get more accurate results

@@         Coverage Diff          @@
##           main   #9878   +/-   ##
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  Coverage    63%     63%           
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  Files       203     203           
  Lines      9826    9826           
  Branches   1564    1564           
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+ Hits       6243    6249    +6     
+ Misses     3079    3071    -8     
- Partials    504     506    +2     

Impacted Files	Coverage Δ
...rc/platform/common/dataScienceSurveyBanner.node.ts	70% <0%> (+5%)	⬆️