**What happened:**

My password for external Postgres RDS contained '@123' at the end which got appended to the host of the DB due to some bug. One can notice in the logs, the DB_HOST has an unwanted 123@ in the front of it  DB_HOST=**123@**{{postgres_host}}. I removed '@' character from the password and it worked fine. 

I am using the latest image of apache/airflow and using the official helm chart.

```
kc logs airflow-run-airflow-migrations-xxx
BACKEND=postgresql
DB_HOST=123@{{postgres_host}}
DB_PORT=5432
....................
ERROR! Maximum number of retries (20) reached.

Last check result:
$ run_nc '123@{{postgres_host}}' '5432'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
socket.gaierror: [Errno -2] Name or service not known
Can't parse  as an IP address
```

**Steps to reproduce:**
One can easily reproduce this by using a password that contains the '@' character in it.
```
data:
  metadataConnection:
    user: {{postgres_airflow_username}}
    pass: {{postgres_airflow_password}}
    protocol: postgresql  
    host: {{postgres_host}}
    port: 5432
    db: {{postgres_airflow_dbname}}
```

**Expected behavior:**
Migrations should run irrespective if the Postgres password contains an @ character or not.
chart/tests/test_redis.py
expected_broker_url_secret_name = "redis-broker-url-secret-name"
        k8s_objects = render_chart(
            RELEASE_NAME_REDIS,
            {
                "executor": executor,
                "networkPolicies": {"enabled": True},
                "data": {"brokerUrlSecretName": expected_broker_url_secret_name},
                "redis": {"enabled": False},
            },
        )
        k8s_obj_by_key = prepare_k8s_lookup_dict(k8s_objects)
        created_redis_objects = SET_POSSIBLE_REDIS_OBJECT_KEYS & set(k8s_obj_by_key.keys())
        assert created_redis_objects == set()
        self.assert_password_and_broker_url_secrets(
            k8s_obj_by_key, expected_password_match=None, expected_broker_url_match=None
        )
        self.assert_broker_url_env(k8s_obj_by_key, expected_broker_url_secret_name)
    def test_should_create_valid_affinity_tolerations_and_node_selector(self):