### Apache Airflow Provider(s)

snowflake

### Versions of Apache Airflow Providers

apache-airflow-providers-snowflake==2.2.0 

### Apache Airflow version

2.2.0

### Operating System

Linux-5.4.141-67.229.amzn2.x86_64-x86_64-with-glibc2.31

### Deployment

Astronomer

### Deployment details

_No response_

### What happened

The `get_connection()` method is called twice in the SnowflakeHook, initializing the connection twice and slowing the hook down. See the following example logs on a single `run` of the SnowflakeHook:


<img width="1383" alt="Screen Shot 2021-11-09 at 9 59 26 PM" src="https://user-images.githubusercontent.com/30101670/141052877-648a5543-cf9a-4c16-82a6-02f6b62b47ba.png">



### What you expected to happen

The code is using the `get_connection` method on [line 271](https://github.com/apache/airflow/blob/main/airflow/providers/snowflake/hooks/snowflake.py#L271) and then calling the method again on [line 272](https://github.com/apache/airflow/blob/main/airflow/providers/snowflake/hooks/snowflake.py#L272)

### How to reproduce

Run the SnowflakeHook

### Anything else

_No response_

### 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/snowflake/hooks/snowflake.py
"""Returns custom field behaviour"""
        import json
        return {
            "hidden_fields": ['port'],
            "relabeling": {},
            "placeholders": {
                'extra': json.dumps(
                    {
                        "authenticator": "snowflake oauth",
                        "private_key_file": "private key",
                        "session_parameters": "session parameters",
                    },
                    indent=1,
                ),
                'host': 'snowflake hostname',
                'schema': 'snowflake schema',
                'login': 'snowflake username',
                'password': 'snowflake password',
                'extra__snowflake__account': 'snowflake account name',
                'extra__snowflake__warehouse': 'snowflake warehouse name',
                'extra__snowflake__database': 'snowflake db name',
                'extra__snowflake__region': 'snowflake hosted region',
                'extra__snowflake__aws_access_key_id': 'aws access key id (S3ToSnowflakeOperator)',
                'extra__snowflake__aws_secret_access_key': 'aws secret access key (S3ToSnowflakeOperator)',
                'extra__snowflake__role': 'snowflake role',
            },
        }
    def __init__(self, *args, **kwargs) -> None: