`impeller_frame` makes debugging gpu usage on ios difficult

At some point we changed the way we handle frames in impeller on Metal. This broke the "Graphics Overlay" (it just doesn't show up) and broke the gpu probes inside of xcode when executing an app. You can sometimes profile with the frame debugger to get a sense but the "impeller_frame" boundary doesn't always show up making it impossible to measure.

xcode's gpu probe is empty

`impeller_frame` option not available

seen on: xcode 15.4

My understanding is that this was related to a change in [`displaySyncEnabled`](https://developer.apple.com/documentation/quartzcore/cametallayer/2887087-displaysyncenabled). I think there is a plist argument to avoid it.

cc @jonahwilliams