This class registers emitters which should be disposed

The panel currently exposes a `disposables` protected member. In order to catch possible leaks of disposables, we should extend `Disposable` instead

This class already is an implicit IDisposable and a number of subclasses to it re-implement the Disposable logic

This overload was not heavily used and added complexity

`lifecycle/Disposable` includes some important fixes that can help catch common programming mistakes

Emitters should be disposed of properly in order to help prevent leaks

The dom.d.ts types changed to not allow null on the outline styles. I believe that setting this to empty string should be equivalent

Either extend `Disposable` or use a readonly `DispoableStore`

for microsoft/vscode-remote-release#544

This reverts commit d0e1fe59.

Fixes #70577