Make anyArray.filter(Boolean) return any[], not unknown[] (#31515)

* Add this-parameter workaround to Array.filter

Allows anys.filter(Boolean) to once again return any[], not unknown[].

* Add any constraint to Boolean factory function

I want to test how well this works.

* Remove Boolean factory type guard

* Remove typeGuardBoolean test

src/lib/es5.d.ts

@@ -513,7 +513,7 @@ interface Boolean {
 
 interface BooleanConstructor {
     new(value?: any): Boolean;
-    <T>(value?: T): value is Exclude<T, false | null | undefined | '' | 0>;
+    <T>(value?: T): boolean;
     readonly prototype: Boolean;
 }