AzContext change for resource/resourceGroup discovery

[daltondhcp]

Overview/Summary

Updated AzContext object creation to overcome Get-AzContext -ListAvailable 25 context limit causing random resource group discovery failures in larger environments.

Closing #555

Testing Evidence

• Validated resourceGroup and resource discovery in test environment
• Validated fix in environment that was previously failing with help from @egullbrandsson

As part of this Pull Request I have

• Checked for duplicate Pull Requests
• Associated it with relevant issues, for tracking and closure.
• Ensured my code/branch is up-to-date with the latest changes in the main branch
• Performed testing and provided evidence.
• Updated relevant and associated documentation.

[egullbrandsson]