Make the `enableSchedulingProfiler` flag dynamic for the profiling build (so marks can be disabled). I think it should be sufficient to do something like:
```js
export const enableSchedulingProfiler =
  __PROFILE__ && dynamicFeatureFlags.enableSchedulingProfiler;
```

Update our User Timing API check to include `clearMeasures` and when we call `mark(name)`, also call `clearMeasures(name)` to avoid clogging the entries buffer. (Apparently this has a significant negative performance impact for Firefox.)
}
    ReactTestRenderer.create(
      <React.Suspense fallback={null}>
        <Example />
      </React.Suspense>,
      {unstable_isConcurrent: true},
    );
    expect(marks).toEqual([
      `--react-init-${ReactVersion}`,
      '--schedule-render-512',
    ]);
    marks.splice(0);
    expect(Scheduler).toFlushUntilNextPaint([]);
    expect(marks).toEqual([
      '--render-start-512',
      '--suspense-suspend-0-Example',
      '--render-stop',
      '--commit-start-512',
      '--layout-effects-start-512',
      '--layout-effects-stop',
      '--commit-stop',
    ]);
    marks.splice(0);
    await fakeSuspensePromise;
    expect(marks).toEqual(['--suspense-resolved-0-Example']);
  });
  
  it('should mark concurrent render with suspense that rejects', async () => {
    const fakeSuspensePromise = Promise.reject(new Error('error'));
    function Example() {