Tolerate more ambiguous forms on ember >= 4.0

[ef4]

Because property-this-fallback was dropped at ember 4.0, we don't necessarily need to error in this case.

It would ease migration to not force people to change these locations.

[ef4]

In general, we also can use a docs update to help people understand what order to do things. If you turn on staticComponents and staticHelpers separately you might get a lot of transient busy work.