We don't actually use this anywhere, so let's remove it.

https://github.com/facebook/react/blob/f1d00156df5453bc62bd5668fefdcac4ca67e90e/src/renderers/shared/fiber/ReactFiberScheduler.js#L1504-L1512
firstEffect = finishedWork;
      }
    } else {
      
      firstEffect = finishedWork.firstEffect;
    }
    prepareForCommit();
     Commit all the side-effects within a tree. We'll do this in two passes.
     The first pass performs all the host insertions, updates, deletions and
     ref unmounts.
    nextEffect = firstEffect;
    if (__DEV__) {
      startCommitHostEffectsTimer();
    }
    while (nextEffect !== null) {
      let didError = false;
      let error;
      if (__DEV__) {
        invokeGuardedCallback(null, commitAllHostEffects, null);
        if (hasCaughtError()) {
          didError = true;
          error = clearCaughtError();
        }
      } else {
        try {
          commitAllHostEffects();
        } catch (e) {
          didError = true;
          error = e;
        }