update quick access promises to check prototype instead of instanceof

[zedoax]

Updating the pickerQuickAccess to check the object prototype for Promise compat. Due to how the monaco editor core uses promises, specifically the cancellation token based promise types using its own async bundle, Angular is unable to intercept these promises as ZoneAwarePromise, which causes an error whenever the monaco editor is used within the angular boundary. As this instanceof call compares with the internal Promise type for the instanceof call, but it is a ZoneAwarePromise. This prototype comparison is equivalent in all scenarios as ZoneAwarePromise is a patched promise type, and the prototype is Promise.

microsoft/monaco-editor#4372

[bpasero]

This does not sound right to me, as we have many places where we do instanceof checks for Promise, why would we only change it here in this one place?