loadFlVariant() {
			return Promise.reject("loadFlVariant is not implemented");
		}
Fetches all flex objects related to the given variant reference

@param {object} mPropertyBag - Property bag
@param {string} mPropertyBag.reference - Flexibility reference
@param {string} mPropertyBag.variantReference - Variant reference to be loaded
@param {string} [mPropertyBag.url] - Configured URL for the connector
@param {sap.ui.fl.Layer} [mPropertyBag.layer] - Layer of the objects to be loaded
@returns {Promise<object>} Resolves with the data for variant