**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
#
#
import re
import unittest
from base64 import b64decode
from subprocess import CalledProcessError
from typing import Optional
import jmespath
import pytest
from parameterized import parameterized
from tests.helm_template_generator import prepare_k8s_lookup_dict, render_chart
RELEASE_NAME_REDIS = "TEST-REDIS"
REDIS_OBJECTS = {
    "NETWORK_POLICY": ("NetworkPolicy", f"{RELEASE_NAME_REDIS}-redis-policy"),
    "SERVICE": ("Service", f"{RELEASE_NAME_REDIS}-redis"),
    "STATEFUL_SET": ("StatefulSet", f"{RELEASE_NAME_REDIS}-redis"),
    "SECRET_PASSWORD": ("Secret", f"{RELEASE_NAME_REDIS}-redis-password"),
    "SECRET_BROKER_URL": ("Secret", f"{RELEASE_NAME_REDIS}-broker-url"),
}
SET_POSSIBLE_REDIS_OBJECT_KEYS = set(REDIS_OBJECTS.values())
CELERY_EXECUTORS_PARAMS = [("CeleryExecutor",), ("CeleryKubernetesExecutor",)]
class RedisTest(unittest.TestCase):