Currently `SlackWebhookHook` gets the token from `extra` but it would be more secure and intuitive to have it in password.

https://github.com/apache/airflow/blob/4fb5c017fe5ca41ed95547a857c9c39efc4f1476/airflow/providers/slack/hooks/slack_webhook.py
tests/providers/slack/hooks/test_slack_webhook.py
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import json
import unittest
from unittest import mock
from requests.exceptions import MissingSchema
from airflow.models import Connection
from airflow.providers.slack.hooks.slack_webhook import SlackWebhookHook
from airflow.utils import db
class TestSlackWebhookHook(unittest.TestCase):