[Modules] Connect Azure Firewall to a VirtualHub

[fblix]

Description

This PR introduces and fixes the functionality towards Azure Firewalls in combination with Secured Virtual Hubs.
A bit of background:
An Azure Firewall can be configured to either run in an VirtualNetwork setup (Sku: AzFw_Vnet) or in a Secured Virtual Hub context (Sku: AzFw_hub). A firewall can therefore be deployed without a virtual network and instead with a secured virtual hub.

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It is also not possible to attach a Azure Firewall to a Virtual Hub but only in reverse order. If you allow the AzureFirewallId property in the virtual hub two things happen:

• The firewall is empty (has no policies attached): the deployment will succeed but not change anything.
• The firewall has policies attached: the deployment will fail with either:
  • Standard SKU: {"code":"DeploymentFailed","message":"At least one resource deployment operation failed. Please list deployment operations for details. Please see https://aka.ms/DeployOperations for usage details.","details":[{"code":"AzureFirewallSkuCannotBeUpdated","message":"Update on SKU is not supported for Azure Firewall standard."}]}
  • Premium SKU: {"code":"DeploymentFailed","message":"At least one resource deployment operation failed. Please list deployment operations for details. Please see https://aka.ms/DeployOperations for usage details.","details":[{"code":"AzureFirewallSkuCannotBeUpdated","message":"Update on SKU is not supported for Azure Firewall premium (Sku name change is not allowed)."}]}

Following the documentation https://learn.microsoft.com/en-us/azure/firewall-manager/deployment-overview reveals that there is a specific deployment order to be followed. Thus, we only enabled the connection between firewall and vhub to be established from the firewall side and NOT vice-versa to keep control of the deployment order

Pipeline references

Pipeline

Type of Change

Please delete options that are not relevant.

• Bugfix (non-breaking change which fixes an issue)

Checklist

• I'm sure there are no other open Pull Requests for the same update/change
• My corresponding pipelines / checks run clean and green without any errors or warnings
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (readme)
• I did format my code

[github-actions]

Test Results

  1 files    1 suites   45s ⏱️
54 tests 53 ✔️ 1 💤 0 ❌
94 runs  89 ✔️ 5 💤 0 ❌

Results for commit 1de867a.

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