### 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
"application": os.environ.get("AIRFLOW_SNOWFLAKE_PARTNER", "AIRFLOW"),
        }
        if insecure_mode:
            conn_config['insecure_mode'] = insecure_mode
        
        
        
        
        private_key_file = conn.extra_dejson.get('private_key_file')
        if private_key_file:
            with open(private_key_file, "rb") as key:
                passphrase = None
                if conn.password:
                    passphrase = conn.password.strip().encode()
                p_key = serialization.load_pem_private_key(
                    key.read(), password=passphrase, backend=default_backend()
                )
            pkb = p_key.private_bytes(
                encoding=serialization.Encoding.DER,
                format=serialization.PrivateFormat.PKCS8,
                encryption_algorithm=serialization.NoEncryption(),
            )
            conn_config['private_key'] = pkb
            conn_config.pop('password', None)
        return conn_config
    def get_uri(self) -> str:
        """Override DbApiHook get_uri method for get_sqlalchemy_engine()"""
        conn_params = self._get_conn_params()
        return self._conn_params_to_sqlalchemy_uri(conn_params)
    def _conn_params_to_sqlalchemy_uri(self, conn_params: Dict) -> str: