[TASK] Rename enhancer

Change the name of the enhancer from 'CombinedFacetEnhancer' to
'SolrFacetMaskAndCombineEnhancer' in order to keep clear what
this enhancer does.

Fixes: #2257

config/sites/solr-testsystem/config.yaml

@@ -56,7 +56,7 @@ solr_use_write_connection: false
 # Configuration for the route enhancer
 routeEnhancers:
   Products:
-    type: CombinedFacetEnhancer
+    type: SolrFacetMaskAndCombineEnhancer
     limitToPages:
       - 7
     extensionKey: tx_solr