Fixes #73496

Also differentiate default from system shell

Part of #75795

Fixes #72155

Adds a constant to the api that tracks the root path for resources inside of webviews. This is required because we will not be able to use `vscode-resource:` uris on the web. Our current approach is to rewrite the html we are given but there are almost certainly going to be cases where we don't get this quite right.

Adopts the new api for the markdown preview

Fixes #75718

For #74846

Migrates from using the heap service to have an explicit lifecycle

This function does not modify the input array

Part of #74846

Code Actions can use commands internally, which must be disposed of. We were previously using the heap service for this but this will not work for the web. Add a custom lifecycle instead

debt - decouple webviews from code insets, move things to /browser/-layer, change inset api proposal to push style, re #66418

For #72824

Part of #72518

* Comments API Finalization

* Provide API to get access to the workspace configuration file (#37421)

* fix untitled ID

* update docs

Fixes #72152