Ensures all of the libraries that the application side code import are migrated to null safety. full null safety migration is blocked by json rpc 2 and a breaking change to vm service client.
As of flutter.dev/go/engine-cpu-profiling, we collect the CPU and
Memory usage. With work being done to collect GPU usage on iOS as well.
This adds them to the timeline summary.
Fixes: https://github.com/flutter/flutter/issues/58803
