IotHub Custom Policies

Overview/Summary

Replace this with a brief description of what this Pull Request fixes, changes, etc.

This PR fixes/adds/changes/removes

1. Added IotHub Custom Policies

As part of this Pull Request I have

• [x] Checked for duplicate Pull Requests
• [x] Associated it with relevant issues, for tracking and closure.
• [x] Ensured my code/branch is up-to-date with the latest changes in the main branch
• [x] Performed testing and provided evidence.
• [ ] Updated relevant and associated documentation.
• [ ] Updated the "What's New?" wiki page (located: /docs/wiki/whats-new.md)

@jtracey93

Azure IoT Hub

Policy Name	Policy Area	Description
Append-IotHub-MinimalEncryption	Encryption	Enforces minimal tls version 1.2 for iot hub.
Deny-IotHub-Sku	Busget	Enforces iot hub SKUs.

@krnese May require your help to work on one of the deployIfNotExists policies (Azure Defender for IoT Hub). Let me know, if you have time for that. I have written a policy but had some trouble with getting it to work. If I remember correctly, it was not triggered as expected.

@krnese I would enforce the following on the Corp Management Group:

Deny PublicNetworkAccess (Definition ID: /providers/Microsoft.Authorization/policyDefinitions/2d6830fb-07eb-48e7-8c4d-2a442b35f0fb)

• Closing as superseded by #1144