**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
@staticmethod
    def get_broker_url_in_broker_url_secret(k8s_obj_by_key):
        broker_url_in_obj = b64decode(
            k8s_obj_by_key[REDIS_OBJECTS["SECRET_BROKER_URL"]]["data"]["connection"]
        ).decode("utf-8")
        return broker_url_in_obj
    @staticmethod
    def get_redis_password_in_password_secret(k8s_obj_by_key):
        password_in_obj = b64decode(
            k8s_obj_by_key[REDIS_OBJECTS["SECRET_PASSWORD"]]["data"]["password"]
        ).decode("utf-8")
        return password_in_obj
    @staticmethod
    def get_broker_url_secret_in_deployment(k8s_obj_by_key, kind: str, name: str) -> str:
        deployment_obj = k8s_obj_by_key[(kind, f"{RELEASE_NAME_REDIS}-{name}")]
        containers = deployment_obj["spec"]["template"]["spec"]["containers"]
        container = next(obj for obj in containers if obj["name"] == name)
        envs = container["env"]
        env = next(obj for obj in envs if obj["name"] == "AIRFLOW__CELERY__BROKER_URL")
        return env["valueFrom"]["secretKeyRef"]["name"]
    def assert_password_and_broker_url_secrets(