Fix multiple issues

[krowlandson]

Overview/Summary

This PR contains a number of small updates to address issues from our backlog as listed below

This PR fixes/adds/changes/removes

1. Update module to support the AzureRM provider for Terraform from version v3.0.2 onwards:
   1. Fix Bug Report - AzureRM provider 3.0.0 availability zones error #309
   2. Fix azurerm_public_ip prevents support of azurerm provider >= 3.0.0 #319
2. The threat_intel_mode value for azurerm_firewall resources is now explicitly set with a default value of Alert to support the latest provider versions. This matches the previous "default" value of the old provider.
3. Cast empty_map local to the tomap() function to fix Call to function "coalesce" failed: all arguments must have the same type. #340
4. Added new variable asc_export_resource_group_name to fix Ability to rename ASC export resource group name #342
5. Add logic to automatically configure the generation value for VPN gateways without using the advanced object to fix VPN Gateway Generations #333
6. Added input variables and logic to simplify configuring active-active mode for VPN gateways without using the advanced object to fix can't create active-active vpngw #232
7. Added logic to suppress creation of Public IP resource(s) when a custom ip_configuration input is specified via the advanced block for the following resource types:
   1. azurerm_virtual_network_gateway (ExpressRoute and VPN)
   2. azurerm_firewall
8. Added input variables for BGP configuration settings without using the advanced object to fix BGP configuration on VPN gateways #334
9. Added missing vpn_auth_types attribute for the vpn_client_configuration block on Virtual Network Gateway resources
10. Updated Wiki docs to reflect the included changes where covered in documentation
11. Updated test framework to provide coverage of the included fixes
12. Updated test strategy to ensure working versions are included from v0.15.1 (new minimum required to fix Error: Output refers to sensitive values) to latest v1.1.x

Breaking Changes

1. To support the AzureRM provider for Terraform from version v3.0.2 onwards; To configure availability zones for azurerm_public_ip resources using the advanced input, you must now provide zone inputs as a collection of string values within a zones input, as availability_zone is no longer supported by the provider. Valid values (at the time of writing), include:
   1. "No-Zone",
   2. "1",
   3. "2",
   4. "3",
   5. "Zone-Redundant",
2. By setting a preference to Generation2 for supported VPN gateway SKUs, customers may have their VPN gateway redeployed to the new version. Instructions for how to override this must be added to the release notes.
3. In order to address some of the issues fixed above, we have had to make breaking changes to the mandatory schema. This will result in an error at plan until users update the input for configure_connectivity_resources. Longer term objective is to reduce the number of mandatory attributes within the schema using the optional() type wrapper once released as GA.

Testing Evidence

Please provide any testing evidence to show that your Pull Request works/fixes as described and planned (include screenshots, if appropriate).

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 "What's New?" wiki page (located in the Enterprise-Scale repo in the directory: /docs/wiki/whats-new.md)

[krowlandson]

Should simplify and may also fix the issue described in #259 but requires further investigation.

[krowlandson]

/azp run unit

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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 unit

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[krowlandson]

/azp run unit

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Azure Pipelines successfully started running 1 pipeline(s).

[krowlandson]

New test strategy picking up correct versions 👍🏻

[matt-FFFFFF]

[krowlandson]

/azp run unit

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Azure Pipelines successfully started running 1 pipeline(s).

[krowlandson]

/azp run e2e

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Azure Pipelines successfully started running 1 pipeline(s).