Fixes https://github.com/microsoft/vscode-remote-release/issues/2711

fixes #104783

only add menu contribution when having call hierarchy providers, https://github.com/microsoft/vscode/issues/104727

We will probably need to find a different solution for sandbox and should reduce exposure so that not everyone is seeing this hack

We will consume the playground from https://github.com/microsoft/vscode-web-playground going forward.

Don't account for excluded providers, since the user can change those dynamically and we don't want the view to hide itself

Fixes #104859

#104727

Fixes #102979

This changes unreachable code from a warning presented in the editor to an error. Existing issues mostly revolved around switching on enums. These were fixed by converting the switches to use a default case, leaving the behavior unchanged in case of new values (e.g. from separately-compiled extensions) creeping in.

Other cases had to do with the assert.fail() function, which throws and so shouldn't have anything following it.
Co-authored-by: NMaksym Taran <maksym.taran@gmail.com>

Fix #104843

Fix #104229

This reverts commit 04f2a740.

#99716

* fix #104698 Make query element of uri survive conflict resolution massaging

* Incorporate PR feedback

* Simplify

* Event simpler, and with comments

* Variant preferred by @bpasero

part of #104714