Remove faulting property location from azapi_resource (#1053)

<!-- markdownlint-disable first-line-h1 -->

## Overview/Summary

Corrects the property bag for the azapi_resource that creates diagnostic
settings on management groups. It doesn't support a `location` property.

## This PR fixes/adds/changes/removes

1. #1052 

### Breaking Changes

N/A

## Testing Evidence

N/A

## As part of this Pull Request I have

- [x] Checked for duplicate [Pull
Requests](https://github.com/Azure/terraform-azurerm-caf-enterprise-scale/pulls)
- [x] Associated it with relevant
[issues](https://github.com/Azure/terraform-azurerm-caf-enterprise-scale/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/terraform-azurerm-caf-enterprise-scale/tree/main)
- [x] Performed testing and provided evidence.
- [ ] Updated relevant and associated documentation.

Co-authored-by: Matt White <[email protected]>

resources.management_groups.tf

@@ -82,7 +82,6 @@ resource "azapi_resource" "diag_settings" {
   for_each                  = local.azapi_mg_diagnostics
   type                      = "Microsoft.Insights/diagnosticSettings@2021-05-01-preview"
   name                      = "toLA"
-  location                  = "global"
   parent_id                 = each.key
   schema_validation_enabled = false
   body = {