Bastion: Deploying Bastion with Developer Sku using Bicep

### Resource Type

Microsoft.Network/bastionHosts

### Api Version

2023-04-01

### Issue Type

Missing property(s)

### Other Notes

trying to deploy bastion dev sku using bicep
```
resource bastion 'Microsoft.Network/bastionHosts@2023-04-01' = {
name: 'name'
location: location
sku: {
name: 'Developer'
}
}
```
but it keeps throwing up this error:
```
{
"code": "BastionHostVnetIdNotProvided",
"message": "Virtual Network Id is a mandatory field for Developer BastionHost SKU.",
"details": []
}
```
so i try

```
resource bastion 'Microsoft.Network/bastionHosts@2023-04-01' = {
name: '${prefix}${currentTime}'
location: location
sku: {
name: 'Developer'
}
virtualnetwork: {
id: vnet.id
}
```
but it says:
`
The property "virtualNetwork" is not allowed on objects of type "Microsoft.Network/bastionHosts". Permissible properties include "asserts", "dependsOn", "properties", "tags". If this is an inaccuracy in the documentation, please report it to the Bicep Team.bicephttps://aka.ms/bicep-type-issues
`

### Bicep Repro

_No response_

### Confirm

- [X] I have read the troubleshooting guide and looked for duplicates.

Start with the Microsoft.Network/bastionHosts resource definition for API version 2023-04-01 and compare the Developer SKU requirements with the two Bicep snippets. Verify how the virtual network ID is represented in the type definition, then validate the corrected shape against Bicep diagnostics; done means a Developer SKU declaration accepts the required VNet reference without the reported error.

Written by the indexing model from the issue text.