fix(ui): remove old mocks

ui/src/__mocks__/lodash.debounce.ts

@@ -1,4 +0,0 @@
-export default function debounce(wrapped: any) {
-  wrapped.cancel = jest.fn();
-  return wrapped;
-}

ui/src/__mocks__/lodash.throttle.ts

@@ -1,3 +0,0 @@
-export default function throttle(wrapped: any) {
-  return wrapped;
-}