Stop passing `write_in_microsurvey` from `AWGetFeatureConfig` to the `AWSendEventTelemetry` call. Instead, the surface that provides the `AWSendEventTelemetry` method will just insert it in the method definition and pass it straight to `AboutWelcomeTelemetry`. This means the React component does not have to be aware of the property at all. Differential Revision: https://phabricator.services.mozilla.com/D301946