Remove legacy disconnect

Author: romain-trotard

src/wait-for.js

@@ -95,10 +95,6 @@ function waitFor(
  if (!usingFakeTimers) {
  clearInterval(intervalId)
  observer.disconnect()
-
- // Call also the disconnect method on setImmediate for projects not using the MutationObersver implementation of jsdom.
- // But using for example `@sheerun/mutationobserver-shim` which provokes infinite loop when being called immediately on `onDone` function
- setImmediate(() => observer.disconnect())
  }
 
  if (error) {