lock_mode duplicate local value definition

The local named "lock_mode" is defined in both \subscription_infra_map\locals.tf and \subscription_infa_map\locals.locks.tf, causing the error below when running terraform init:

```
│ Error: Duplicate local value definition
│
│ on ..\subscription_infra_map\locals.tf line 2, in locals:
│ 2: lock_modes = {
│ 3: no_delete = "CanNotDelete"
│ 4: read_only = "ReadOnly"
│ 5: }
│
│ A local value named "lock_modes" was already defined at ..\subscription_infra_map\locals.locks.tf:2,3-5,4. Local value names must be unique within a module.
```