### Apache Airflow Provider(s)

snowflake

### Versions of Apache Airflow Providers

Versions 2.2.x (since https://github.com/apache/airflow/commit/0a37be3e3cf9289f63f1506bc31db409c2b46738).


### Apache Airflow version

2.2.1

### Operating System

Debian GNU/Linux 10 (buster)

### Deployment

Other 3rd-party Helm chart

### Deployment details

Bitnami Airflow Helm chart @ version 8.0.2

### What happened

When connecting to Snowflake via SQLAlchemy using the Snowflake Hook, I get an error that the URL is not valid because my Snowflake instance is in US West 2 (Oregon) which means I don't provide a region explicitly. Snowflake's documentation says:
> If the account is located in the AWS US West (Oregon) region, no additional segments are required and the URL would be xy12345.snowflakecomputing.com

The error is that `xy12345..snowflakecomputing.com` is not a valid URL (note the double-dot caused by the lack of a region).

### What you expected to happen

I expect the connection to be successful.

### How to reproduce

You can use the default snowflake connection if you have one defined and see this problem with the following one-liner:
```shell
python -c 'from airflow.providers.snowflake.hooks.snowflake import SnowflakeHook; SnowflakeHook().get_sqlalchemy_engine().connect()'
```

### Anything else

Fortunately I imagine the fix for this is just to leave the region URL component out when `region` is `None` here: https://github.com/apache/airflow/commit/0a37be3e3cf9289f63f1506bc31db409c2b46738#diff-2b674ac999a5b938fe5045f6475b0c5cc76e4cab89174ac448a9e1d41a5c04d5R215.

Using version `2.1.1` of the Snowflake provider with version `2.2.1` of Airflow is currently a viable workaround so for now I am just avoiding the update to the provider.

### Are you willing to submit PR?

- [ ] 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/snowflake/hooks/snowflake.py
'account', ''
        )
        warehouse = conn.extra_dejson.get('extra__snowflake__warehouse', '') or conn.extra_dejson.get(
            'warehouse', ''
        )
        database = conn.extra_dejson.get('extra__snowflake__database', '') or conn.extra_dejson.get(
            'database', ''
        )
        region = conn.extra_dejson.get('extra__snowflake__region', '') or conn.extra_dejson.get('region', '')
        role = conn.extra_dejson.get('extra__snowflake__role', '') or conn.extra_dejson.get('role', '')
        schema = conn.schema or ''
        authenticator = conn.extra_dejson.get('authenticator', 'snowflake')
        session_parameters = conn.extra_dejson.get('session_parameters')
        insecure_mode = to_boolean(
            conn.extra_dejson.get(
                'extra__snowflake__insecure_mode', conn.extra_dejson.get('insecure_mode', None)
            )
        )
        conn_config = {
            "user": conn.login,
            "password": conn.password or '',
            "schema": self.schema or schema,
            "database": self.database or database,
            "account": self.account or account,
            "warehouse": self.warehouse or warehouse,
            "region": self.region or region,
            "role": self.role or role,
            "authenticator": self.authenticator or authenticator,
            "session_parameters": self.session_parameters or session_parameters,