There are two functions which do the same thing and are meant to search
for the closest loaded config in the `ActivatedRouteSnapshot` parent
tree. These can be combined to reduce code duplication.
One difference in the current implementation is the early exit for the
implementation in `activate_routes` when `route.component` is defined.
This early exit takes advantage of the fact that the component must then
also have a `RouterOutlet`, which injects `ComponentFactoryResolver`,
which would end up being the same one as what would be found if we
continued to look up the parent tree. This is only a tiny optimization
that will actually break when we add `providers` as a feature to the
`Route` config. In this scenario, we _must_ find the correct injector
in the parent routes and cannot rely on a parent `RouterOutlet` since
there may be some route with a providers list in between.
PR Close#45613
000363eec5