Fix the onDidChangeActiveNotebookEditorEmitter to fire correctly #14321
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What it does
Fixes the onDidChangeActiveNotebookEditorEmitter to fire correctly when the active notebook has been changed.
This should also fix the issue with the jupyter variables button not appearing
How to test
You can again test with my notebook selection test extension
this should show that the active notebook editor should always be correct.
Also the jupyter variables button should now appear again
Follow-ups
@dhuebner maybe good candidate for automated ui tests?
Review checklist
Reminder for reviewers