Add new connectivity capabilities

[krowlandson]

Overview/Summary

This PR includes fixes for a number of recent issues, as listed below.

This PR fixes/adds/changes/removes

1. Fixes Feature Request - vwan hub connections - Internet_Security_Enabled should be a variable. #491
2. Fixes Bug Report - enable_private_dns_zone_virtual_network_link_on_hubs = true failing on disabled hub #542
3. Fixes Feature Request: Deploy private dns zones and link them to an existing vnet #549
4. Fixes previously unidentified issue with logic for mesh peering (similar to Feature Request: Deploy private dns zones and link them to an existing vnet #549)
5. Removes sensitive value filtering as per discussion to close Bug Report Terraform plan fails due to sensitive values in azurerm_automation_account output #499

Breaking Changes

None

Testing Evidence

Please refer to the updated test framework results, and additional evidence provided in the following issues:

• Feature Request - vwan hub connections - Internet_Security_Enabled should be a variable. #491
• Bug Report - enable_private_dns_zone_virtual_network_link_on_hubs = true failing on disabled hub #542
• Feature Request: Deploy private dns zones and link them to an existing vnet #549
• Bug Report Terraform plan fails due to sensitive values in azurerm_automation_account output #499

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.
• Updated the "RELEASE" page with details needed for when this code change is released.

[krowlandson]

/azp run update

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Azure Pipelines successfully started running 1 pipeline(s).

[krowlandson]

/azp run unit

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[krowlandson]

/azp run update

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).