Fix exercise 1, 2, 6 tests

[kentcdodds]

Every test gives the error: internals.injectProfilingHooks is not a function

[kentcdodds]

This is what we have now. There's no longer an injectProfilingHooks value. Maybe we need to use the profiling version of React?

[kentcdodds]

Might look into https://react-scan.com/ and see how they track renders. Maybe we could even use it 🤔

[kentcdodds]

Fixed by #138