Get Google Ads customers for the current user from the database.
Args: current_user: The currently authenticated user (injected dependency)
Returns: list[GoogleAdsCustomerSchema]: List of Google Ads customers for the user.
The access token received from the authorization server in the OAuth 2.0 flow.
Successful Response
The customer ID
The descriptive name of the customer
The currency code
The time zone
The status of the customer
Whether the customer is a manager account