"az containerapp env create" returns before resource is in a usable state

## Describe the bug

**Command Name**
`az containerapp env create
Extension Name: containerapp. Version: 0.3.5.`

**Errors:**
```
none
```

## To Reproduce:
Steps to reproduce the behavior:

- `az containerapp env create --name testenv -g rg-test --location westeurope`

## Expected Behavior

I would expect that the cli returns when the ContainerApps environment is actually created and in a usable state, consistently to what happens for other resource providers I have encountered so far.

However, I have noticed that this is not always the case, especially if you pass the `--infrastructure-subnet-resource-id` parameter.

## Environment Summary
```
Windows-10-10.0.22000-SP0
Python 3.10.4
Installer:

azure-cli 2.37.0

Extensions:
containerapp 0.3.5

Dependencies:
msal 1.18.0b1
azure-mgmt-resource 21.1.0b1
```
## Additional Context