This reverts commit 4a38520d.

For #33413

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

Fixes #64216

This reverts commit 714b18d1.

#54972

Instead of having a generic `Retrigger` reason, add a new field on the `SignatureHelpContext` that tracks if this was a retrigger or not. This allows retrigger for all the different trigger reasons, including invoke.

Replace the old `Retriggger` trigger reason with `ContentChange` which tracks cursor movement and text updates.

update internal API to allow parameter label to be an offset-range of its the signature label, #56337

Introduces the concept of a re-trigger character to the signature help provider. This is a seperate set of characters that are registered with the provider. Typing a retrigger character fires a new signature help request if signature help is already showing.

#54972

We compile using the alwaysStrict flag so these directives are not needed

This part removes most `use strict` directives that are right after the file header