fix(retail): add region tag for node.js - Update search with filtering (#4132)

* Update search-simple-query.js

Added region tag to simply search query for code snippet update in the documentation.

* Update search-with-pagination.js

* Update search-with-filtering.js

---------

Co-authored-by: Katie McLaughlin <[email protected]>

Author: rebeccaellis

retail/interactive-tutorials/search/search-with-filtering.js

@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// [START retail_search_for_products_with_filtering]
 
 'use strict';
 
@@ -82,3 +83,5 @@ process.on('unhandledRejection', err => {
 });
 
 main();
+
+// [END retail_search_for_products_with_filtering]