[AVM Module Issue]: Virtual Network with subnets created using AVM bicep module is failing to be associated with Azure Virtual Network Manager (AVNM) IP Address pool (IPAM)

### Check for previous/existing GitHub issues

- [x] I have checked for previous/existing GitHub issues

### Issue Type?

I'm not sure

### Module Name

avm/res/network/virtual-network

### (Optional) Module Version

_No response_

### Description

If you create VNet **with subnets** using `br/public:avm/res/network/virtual-network:0.7.0` module and then try to associate VNet with Azure Virtual Network Manager IP Address Pool (IPAM), it will fail with the following error message.

```
Error: Invalid configuration on subnet ......; cannot populate both address prefix and address prefixes.
```

It looks like that both `addressPrefix` and `addressPrefixes` subnet properties are set during deployment.

It might be that this is a bug at AVNM side, but I report it here anyways :)

### (Optional) Correlation Id

_No response_