For #11279

* Fix background (again) for ipywidgets (#11062) (#11064)

* Fix arrowing down through cells (#11095)

* Fix scrolling in the monaco editor  (#11089)

* Fix monaco editor scrolling and line height

* Add news entry

* Fixes for UI issues (#11130)

* Cherry pick commits from master into April release (#11138)

* Load widget scripts from CDN and/or local python interpreter (#10987)

* Address sonar issues
* Fix linter
* Fixes
* Better way to pas array buffer
* Added comments
* Oops

* Copy widget scripts to extension folder (#11082)

* Copy widget scripts to extension folder
* Fix test

* Remove aml scripts from extension (#11085)

* Validate python when nb opened not on extension activates (#11087)

For #10893

* Support workspace images in markdown cells (#11086)

For #10893

* Fix functional tests for ipywidgets and download just chrome b… (#11093)

For #11092

playwright downloads other browsers, we need just one chrome (as this is closest to what VSCode is built upon)

* Added tests for k3d widget (#11133)

For #10799, #11096

* Fix failing ipywidget tests (#11132)

For #11099

* Update change log

* Port perf fix to release branch (#11144)

* Fix code lens perf for interactive window (#11142)

* Eliminate first level of redundancy

* Working with a cache

* Add test to verify no more generating cell ranges

* Add news entry

* Clean up on closing

* Make sure close and reopen works

* Fix sonar errors

* Fix restart

* Fix wrong IDisposable type

* Rename restartedKernel to onKernelRestarted

* Recompute when changing settings

* Clear out document close event when document closes

* Update changelog

* Fix build error from missing file

* Port fix for transient data in notebooks. (#11168)

* Remove unwanted elements from cells when saving. (#11164)

* Remove unwanted elements from cells when saving.

* Fix a sonar warning

* FIx another sonar warning

* Update changelog

* Port undo fix to release branch (#11181)

* Fix undo in notebooks (#11167)

* Put back ctrl+z and 'z' for undo. Refactor to use one value to compute custom editor support

* Add news entry

* Update change log

* Ensure save works after saving untitled notebooks (#11190)

* Ensure save works after saving untitled notebooks
* Remove old document

* Port fix for PDF saving to release (#11194)

* Fix pdf viewer so that we just ship the standalone version. (#11192)

* Update changelog

* Fix scrolling when don't have focus (#11246)

* Account for scenarios where module name is undefined (#11248)

For #11241

* Add message when widget script is not found on CDN (#11249)

For #11247
* Add message
* Add tests
* Fix typo

* Fix failing unit tests on windows (#11191) (#11277)

Co-authored-by: Rich Chiodo <rchiodo@users.noreply.github.com>

* Display error message when fetching script source timesout (#11276)

For #11242
* Add error for timeout
* Add imports

* Update version and change log for release (#11279)

* Update version

* Update change logs

* Port two fixes to the release branch (#11337)

* Change CDN files to download locally (#11286)

* Working downloader

* Tests passing

* Add more tests

* Add retry test

* Fix build errors. Not sure why not happening locally.

* Fix unit tests

* Fix azure ml on windows
Rework error checking to use status

* Fix sonar error

* Add some more descriptive comments

* More comments

* Refactor some code

* Make sure to not use exists as we're downloading anyway

* Fix container timeout from firing unnecessarily (#11336)

* Fix container timeout from firing unnecessarily

* Check for undefined for timer

* Update changelog

* Wire unhandled widget messages to the jupyter output (#11273)

* Update changelog

* Cherry-pick fixes from master (#11367)

* Temporarily switch to node FS apis in KnownPathsService (#11340)
* Make sure user modules can be imported (#11353)

* Port fixes into April point release (#11392)

Cherry pick the following PRs:

#11248
#11276
#11249
#11280
#11364

* Remove isolate script when running unittest (#11378) (#11407)

* Ensure env gets used when running unittest

* Fix tests

* Move runStartupCommand to global location (#11409)

* Move startup to global (#11402)

* Update change log

* Update version and change logs (#11408)

* Fix widget tests (#11406)

Tests are broken in Release branch

* Disable CDN unit tests. Don't seem to pass on azure (#11441)

* Disable CDN unit tests. Don't seem to pass on azure

* Need to skip in other suite setup too.

* only close interactive session on interactive window close (#11405) (#11437)

* only close interactive session on interactive window close (#11405)

* Fix merge problems

Co-authored-by: Rich Chiodo <rchiodo@users.noreply.github.com>
Co-authored-by: Don Jayamanne <don.jayamanne@yahoo.com>
Co-authored-by: Rich Chiodo <rchiodo@microsoft.com>
Co-authored-by: Ian Huff <ianhu@microsoft.com>