fix: Remove redundant flush of microtask queue

Author: Sebastian Silbermann

Diff for: src/pure.js

@@ -43,21 +43,7 @@ configureDTL({
     const previousActEnvironment = getIsReactActEnvironment()
     setReactActEnvironment(false)
     try {
-      const result = await cb()
-      // Drain microtask queue.
-      // Otherwise we'll restore the previous act() environment, before we resolve the `waitFor` call.
-      // The caller would have no chance to wrap the in-flight Promises in `act()`
-      await new Promise(resolve => {
-        setTimeout(() => {
-          resolve()
-        }, 0)
-
-        if (jestFakeTimersAreEnabled()) {
-          jest.advanceTimersByTime(0)
-        }
-      })
-
-      return result
+      return await cb()
     } finally {
       setReactActEnvironment(previousActEnvironment)
     }