```release-note:bug
resource/aws_cloudwatch_event_connection: Add validation to `auth_parameters.api_key.key`, `auth_parameters.api_key.value`, `auth_parameters.basic.username`, `auth_parameters.basic.password`, `auth_parameters.oauth.authorization_endpoint`, `auth_parameters.oauth.client_parameters.client_id` and `auth_parameters.oauth.client_parameters.client_secret` arguments
```