async getSeenFeatureIds(mPropertyBag) {
			if (!await this.isSeenFeaturesAvailable()) {
				return [];
			}
			return Storage.getSeenFeatureIds(mPropertyBag);
		}
Gets the list of all features that the current user has already set to 'Don't show again'.

@param {object} mPropertyBag - Property bag
@param {string} mPropertyBag.layer - Layer to get the correct connector
@returns {Promise<string[]>} Resolves with a list of viewed features
@ui5-restricted sap.ui.rta