Part of #81574

Part of #81574

Part of #81574

Part of #78168

For #81574

Fixes #81788

TS 3.7 changes the many dom style typings to just be `string` instead of `string | null`. Use empty string in place of null for these cases

This reverts commit d591cb7e.

Fixes #81889

Using `.matches` can cause a custom editor to match all custom editors for that resource. Use a strict compare instead.

Fixes #81791

microsoft/vscode-remote-release#1598

Fixes https://github.com/microsoft/vscode/issues/81767

Fixes https://github.com/microsoft/vscode-remote-release/issues/980

If there is an error while resolving the webview itself, this invisible container can end sticking around incorrectly until the input it destoryed. Better to make sure it is hidden so that it doesn't block user input

Fixes integration tests

Fixes #81767

Fixes https://github.com/microsoft/vscode/issues/81817