Detection of DI on GlobalDrupalSniff is too loose.

Problem/Motivation

Currently the following must be true to catch \Drupal:: calls in DI classes:

Class doesn't extend anything OR Doesn't extend one of those defined as base classes
Is not a service itself
Doesn't implement ContainerInjectionInterface

So this omits a lot of legit cases of plugins as they commonly will use ContainerFactoryPluginInterface

Proposed resolution

Have better detection of container interfaces