fix(@angular/cli): introduce initial package manager workspace awareness

This change adds the getCurrentPackageName method to the package manager abstraction.
When dealing with workspaces (such as npm workspaces), the parser uses the resolved identity of the active package to prioritize dependencies belonging directly to that subproject.

It ensures that running ng update inside a subproject directory resolves the dependency versions declared for that subproject, while gracefully falling back to root hoisted versions for shared dependencies.