dillon1000/react

Consistently use new lowering for OptionalMemberExpression

Earlier PRs in the stack change the way we lower OptionalMemberExpression, but 
only when they ultimately appear inside some OptionalCallExpression. This PR 
ensures that _all_ OptionalMemberExpressions get the new lowering. Note that one 
test case has what is arguably a regression, but the new behavior is also 
reasonable: if we see both `a.b?.c` and `a.b.c.` as dependencies of a scope, we 
previously inferred `a.b.c` as the dependency, but we now infer `a.b` as the 
dependency. This isn't as optimal as what we had before, but it also seems good 
enough for now. Also note that some cases are improved: `foo(a.b?.c)` would 
previously have taken `a.b` as a dependency, we now take the full value of 
`a.b?.c` as a dependency - more precise. 

So overall i'm inclined to land and follow-up on the one regression, since the 
overall model is more cohesive.