Security Context empty when using Python config

[sabinevidal]

Describe the bug
When using Cube Cloud, and sending additional information in the Cube Token via the API, the Security Context in driver_factory is empty. This was working in Javascript. We need to pass additional dynamic data in order to set up multitenancy and would prefer to use the Python implementation.
Edit: this does work in Dev Mode

To Reproduce

1. Create an encoded JWT with the following in the payload, and set the secret to your configured CUBE_API_SECRET

{
  "iat": 1719909131,
  "user_id": 28
}

2. Create the following Cube.py

from cube import config

@config('driver_factory')
def driver_factory(ctx: dict) -> None:
    try:
        print(ctx)
        user = default_userId
        warehouse = default_warehouse
        account = default_account
        database = default_database

        if not user or not warehouse:
            raise ValueError("Missing userId or warehouse in securityContext")

        return {
            'type': 'snowflake',
            'user': user,
            'private_key': private_key_content,
            'database': database,
            'warehouse': warehouse
        }
    except Exception as e:
        print(f"Error in driver_factory: {e}")
        return None

3. Run a curl request with the created JWT and your REST API url.

Expected behavior
Printing ctx in the logs shows "securityContext":{"iat":1719909131,"user_id":28}

Results
From logs

{"message":"REST API Request","path":"/cubejs-api/v1/load?query={omitted}","method":"GET","status":200,"ip":"::ffff:1234567","time":"2024-07-02T11111Z","securityContext":{"iat":1719909131,"user_id":28},"requestId":"12345-span-1"}
{'requestId': 'scheduler-54321', 'dataSource': 'default', 'securityContext': {}, 'authInfo': None}

Version:
[e.g. 0.35.55]

Additional context
Possibly related to
#8133