For #103454

Adds `workbench.workspaceFirstOpen` workspace setting to control applying a default layout
Removes `firstRun` flag from `IDefaultLayout`
Changes `IDefaultEditor` to require a `uri` rather than path+scheme - still supports a fallback until embedders can migrate
Adds `openOnlyIfExists` property to `IDefaultEditor` for better control on if a file should be opened or not

Add override information to inspect

* fix: remove TypeScript from ExtensionSuggestions

* fix: remove TS ExtensionSuggestion completely

* Remove abbreviations

* Fixed spelling mistake

* Added command line information to display details about collected telemetry

* Telemetry tooling exploration

* Changing telemetry calls to be strongly typed

* Fixed an event definition

* Removed telemetry command

* More removing of telemetry command

* Fixed compilation errors

* Forgotten property

* Updated typings so diff was aligned

Part of #74250

- Extend `Disposable` in classes where it makes sense
- Use `DisposableStore` for lists of disposables
- Make `combinedDisposable` take arguments instead of an array (so that you can't pass in an array and then modify the array after the fact)