Also trying to align cases of `getKeyBinding`. Somtimes it returns null and sometimes it returns undefined. Prefer using undefined for all cases

Don't use 'window' in node/ files

For #33413

Adds the active `SignatureHelp` object (along with the active signature) to the `SignatureHelpContext`.

This reverts commit 02d267c5.

fixes #53857

Fix endLineNumber assignment in Problem Matcher