Handle if an install is cancelled and one of the dependencies is incomplete

Today, if you install Az and cancel, it will not fix any remainder dependencies.

Some ways to handle this:
1. Process dependencies first when found. May impact performance
2. Track dependencies separately and place a .incompleteDependencies into a module folder, resolving only when all modules are installed. Lots of potential issues here.

The issue names no files, tests, or entry points. Start by locating the Az installation and cancellation handling, then trace how incomplete dependencies are recorded or retried; done means a cancelled install leaves dependencies in a recoverable state and the behavior is covered by tests.

Written by the indexing model from the issue text.