Microsoft.App/managedEnvironments: "identity" does not exist...

### Resource Type

Microsoft.App/managedEnvironments

### Api Version

2024-03-01

### Issue Type

Inaccurate property type(s)

### Other Notes

`identity` type is missing at the newest api version.


### Bicep Repro

```bicep
resource foo 'Microsoft.App/managedEnvironments@2024-03-01' = {
name: 'name'
location: 'westeurope'
identity: {
type: 'SystemAssigned'
}
}

```

### Confirm

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

Start with the Microsoft.App/managedEnvironments resource definition for API version 2024-03-01 and reproduce the supplied Bicep snippet. Compare the available properties with the API schema, focusing on identity. Done when the type accepts the shown identity block and the repro validates successfully.

Written by the indexing model from the issue text.