HybridManagement cmdlets don't handle multiple subscription deployments well

In general, the HybridManagement cmdlets are written for the scenario where a customer has all of their resources (storage accounts, virtual networks, etc.) deployed within a single environment. Although some customers may have environments like this, it's extremely common for customers to have more complex environments with multiple subscriptions. Our cmdlets should be useful in these environments.

Start by locating the HybridManagement cmdlets and reviewing how they select subscriptions and environments. Compare the current single-subscription assumptions with deployments spanning storage accounts, virtual networks, and other resources across multiple subscriptions. Done means the cmdlets work usefully for the multi-subscription environments described in the issue.

Written by the indexing model from the issue text.