### Apache Airflow Provider(s)

microsoft-azure

### Versions of Apache Airflow Providers

apache-airflow-providers-microsoft-azure==2.0.0

### Apache Airflow version

2.1.0

### Operating System

Debian GNU/Linux

### Deployment

Astronomer

### Deployment details

_No response_

### What happened

Related to #18124.

When attempting to connect to Azure Batch, the following exception is thrown even though the corresponding "Azure Batch Account URl" field is populated in the Azure Batch connection form:
```
airflow.exceptions.AirflowException: Extra connection option is missing required parameter: `account_url`
```
Airflow Connection:
![image](https://user-images.githubusercontent.com/48934154/134413597-260987e9-3035-4ced-a329-3af1129e4ae9.png)


### What you expected to happen

Airflow tasks should be able to connect to Azure Batch when properly populating the custom connection form. Or, at the very least, the above exception should not be thrown when an Azure Batch Account URL is provided in the connection.

### How to reproduce

1. Install the Microsoft Azure provider and create an Airflow Connection with the type Azure Batch
2. Provide values for at least "Azure Batch Account URl"
3. Finally execute a task which uses the AzureBatchHook

### Anything else

The get_required_param() method is being passed a value of "auth_method" from the `Extra` field in the connection form. The `Extra` field is no longer exposed in the connection form and would never be able to be provided.
```python
def _get_required_param(name):
        """Extract required parameter from extra JSON, raise exception if not found"""
        value = conn.extra_dejson.get(name)
        if not value:
           raise AirflowException(f'Extra connection option is missing required parameter: `{name}`')
        return value
...

batch_account_url = _get_required_param('account_url') or _get_required_param(
    'extra__azure_batch__account_url'
)
```

### Are you willing to submit PR?

- [X] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

airflow/providers/microsoft/azure/hooks/azure_batch.py
:type vm_size: str
        :param display_name: The display name for the Pool
        :type display_name: str
        :param target_dedicated_nodes: The desired number of dedicated Compute Nodes in the Pool.
        :type target_dedicated_nodes: Optional[int]
        :param use_latest_image_and_sku: Whether to use the latest verified vm image and sku
        :type use_latest_image_and_sku: bool
        :param vm_publisher: The publisher of the Azure Virtual Machines Marketplace Image.
            For example, Canonical or MicrosoftWindowsServer.
        :type vm_publisher: Optional[str]
        :param vm_offer: The offer type of the Azure Virtual Machines Marketplace Image.
            For example, UbuntuServer or WindowsServer.
        :type vm_offer: Optional[str]
        :param sku_starts_with: The start name of the sku to search
        :type sku_starts_with: Optional[str]
        :param vm_sku: The name of the virtual machine sku to use
        :type vm_sku: Optional[str]
        :param vm_version: The version of the virtual machine
        :param vm_version: str
        :param vm_node_agent_sku_id: The node agent sku id of the virtual machine
        :type vm_node_agent_sku_id: Optional[str]
        :param os_family: The Azure Guest OS family to be installed on the virtual machines in the Pool.
        :type os_family: Optional[str]
        :param os_version: The OS family version
        :type os_version: Optional[str]
        """
        if use_latest_image_and_sku:
            self.log.info('Using latest verified virtual machine image with node agent sku')
            sku_to_use, image_ref_to_use = self._get_latest_verified_image_vm_and_sku(
                publisher=vm_publisher, offer=vm_offer, sku_starts_with=sku_starts_with