LibJS: Consolidate error messages into ErrorTypes.h

Now, exceptions can be thrown with
interpreter.throw_exception<T>(ErrorType:TYPE, "format", "args",
"here").

Libraries/LibJS/Tests/Proxy.handler-deleteProperty.js

@@ -47,7 +47,7 @@ try {
         delete p.foo;
     }, {
         error: TypeError,
-        message: "Proxy handler's delete trap violates invariant: cannot report a non-configurable own property of the target as deleted",
+        message: "Proxy handler's deleteProperty trap violates invariant: cannot report a non-configurable own property of the target as deleted",
     });
 
     console.log("PASS");