async setSeenFeatureIds(mPropertyBag) {
			if (!await this.isSeenFeaturesAvailable()) {
				return Promise.reject("The backend does not support saving seen features.");
			}
			return Storage.setSeenFeatureIds(mPropertyBag);
		}
Sets the list of all features that the current user has already set to 'Don't show again'.
The whole list has to be passed, not only the new entries.

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