Add dependency tags to apex available errors

Having dependency tags in the dependency path that shows why a specific
module is considered part of an apex makes it easier to understand why
that is the case and detect possible issues.

Bug: 152762638
Bug: 153306490
Test: m nothing
Merged-In: Iba2a8a5a6abe03dadee456e760aa4373cd00c07b
Change-Id: Iba2a8a5a6abe03dadee456e760aa4373cd00c07b