Disable shared access key (#93)

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## Overview/Summary

Turn off the ability to use a shared access key on the state file
storage account

## This PR fixes/adds/changes/removes

N/A

### Breaking Changes

None

## Testing Evidence

e2e tests run

## 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.

bootstrap/azuredevops/providers.tf → bootstrap/azuredevops/terraform.tf

@@ -31,6 +31,7 @@ provider "azurerm" {
       prevent_deletion_if_contains_resources = false
     }
   }
+  storage_use_azuread = true
 }
 
 provider "azuredevops" {

bootstrap/github/providers.tf → bootstrap/github/terraform.tf

@@ -31,6 +31,7 @@ provider "azurerm" {
       prevent_deletion_if_contains_resources = false
     }
   }
+  storage_use_azuread = true
 }
 
 provider "github" {

bootstrap/local/providers.tf → bootstrap/local/terraform.tf

@@ -31,4 +31,5 @@ provider "azurerm" {
       prevent_deletion_if_contains_resources = false
     }
   }
+  storage_use_azuread = true
 }

bootstrap/modules/azure/storage.tf

@@ -5,6 +5,7 @@ resource "azurerm_storage_account" "alz" {
   account_tier                    = "Standard"
   account_replication_type        = "GRS"
   allow_nested_items_to_be_public = false
+  shared_access_key_enabled       = false
   public_network_access_enabled   = local.use_private_networking && !var.allow_storage_access_from_my_ip ? false : true
 }