- annotate undefined returned types
- Don't call functions with null or undefined values.
- Refactor _convertCompletionItem so that we don't need to mutate the returned object
- Suppress a type error related to electricCharacters.

add `editor.gotoLocation.many` setting that controls how multiple locations should be handled, #70032

* SelectBox: Remove explicit select role.

* Remove comments

Fix comment typo handker -> handler

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