Terraform Container App Data Source missing property "ingress.client_certificate_mode"

[rlachic]

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There is a mismatch configuration between resource data and data source.

By default, Terraform Azure provider version 4.19 is adding in the ingress block, the client_certificate_mode property.

However, after an apply, if you try to read the container app as data source, fails, because cannot map a missing property:

Planning failed. Terraform encountered an error while generating this plan.

╷
│ Error: setting "ingress": Invalid address to set: []string{"ingress", "0", "client_certificate_mode"}
│ 
│   with data.azurerm_container_app.container_app_backend,
│   on main.tf line 1, in data "azurerm_container_app" "container_app_backend":
│    1: data "azurerm_container_app" "container_app_backend" {
│ 
│ setting "ingress": Invalid address to set: []string{"ingress", "0", "client_certificate_mode"}
```

This is my actual configuration:


```
data "azurerm_container_app" "container_app_backend" {
  name                = "${var.alias}-app-backend-${local.environment}"
  resource_group_name = local.resource_group_name

 provider = azurerm
}
```


### Terraform Version

1.10.15

### AzureRM Provider Version

4.19

### Affected Resource(s)/Data Source(s)

data azurerm_container_app

### Terraform Configuration Files

```hcl
data "azurerm_container_app" "container_app_backend" {
  name                = "${var.alias}-app-backend-${local.environment}"
  resource_group_name = local.resource_group_name

 provider = azurerm
}
```

### Debug Output/Panic Output

```shell
data.azurerm_container_app.container_app_backend: Reading...

Planning failed. Terraform encountered an error while generating this plan.

╷
│ Error: setting "ingress": Invalid address to set: []string{"ingress", "0", "client_certificate_mode"}
│ 
│   with data.azurerm_container_app.container_app_backend,
│   on main.tf line 1, in data "azurerm_container_app" "container_app_backend":
│    1: data "azurerm_container_app" "container_app_backend" {
│ 
│ setting "ingress": Invalid address to set: []string{"ingress", "0", "client_certificate_mode"}
╵
```

### Expected Behaviour

_No response_

### Actual Behaviour

_No response_

### Steps to Reproduce

_No response_

### Important Factoids

_No response_

### References

_No response_

[jiaweitao001]

#28793

[rlachic]

thanks!