feat: use pattern modules for connectivity (#222)

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## Overview/Summary

Replace the connectivity submodules with AVM pattern modules to simplify
the user upgrade process.

## This PR fixes/adds/changes/removes

N/A

### Breaking Changes

None, state is the same.

## Testing Evidence

Ran apply with main, then ran apply with this branch. All changes were
for modtm only.

## As part of this Pull Request I have

- [x] Checked for duplicate [Pull
Requests](https://github.com/Azure/alz-terraform-accelerator/pulls)
- [x] Associated it with relevant
[issues](https://github.com/Azure/alz-terraform-accelerator/issues), for
tracking and closure.
- [x] Ensured my code/branch is up-to-date with the latest changes in
the `main`
[branch](https://github.com/Azure/alz-terraform-accelerator/tree/main)
- [x] Performed testing and provided evidence.
- [x] Updated relevant and associated documentation.

Author: jaredfholgate

templates/platform_landing_zone/main.connectivity.hub.and.spoke.virtual.network.tf

@@ -1,5 +1,6 @@
 module "hub_and_spoke_vnet" {
-  source = "./modules/hub-and-spoke-vnet"
+  source  = "Azure/avm-ptn-alz-connectivity-hub-and-spoke-vnet/azurerm"
+  version = "0.1.0"
 
   count = local.connectivity_hub_and_spoke_vnet_enabled ? 1 : 0
 

templates/platform_landing_zone/main.connectivity.virtual.wan.tf

@@ -1,5 +1,6 @@
 module "virtual_wan" {
-  source = "./modules/virtual-wan"
+  source  = "Azure/avm-ptn-alz-connectivity-virtual-wan/azurerm"
+  version = "0.1.0"
 
   count = local.connectivity_virtual_wan_enabled ? 1 : 0