Fixes #81789

It needs more polishing and should probably only be enabled for files that may have custom editors enabled

Fixes #80617

Some extensions may provide us with bad data types (if they are js or don't have strict null enabled for example). Try to be more careful about handling such cases by falling back to an empty array instead of undefined

Fixes #80777

- Fix keyboard shortcut to show context menu
- Fix showing gear icon when settings row is focused

Remove focus outline on settings editor. It's not tabbable so it doesn't serve any purpose and is annoying to see every time I click on the editor background. Just need to keep .editor-instance from getting focus on click.
Fix #81675

Fixes #81685

#81131

Discovered as part of #81574

Fixes https://github.com/microsoft/vscode/issues/81552

fixes #81630

As part of the fix for #81574, I discovered that a large number of callers were already passing `undefined` for this value. This fix just marks the type as possibly undefined as well