Implemented comment thread target picker with new dropdown components (#295)

* First draft of new relation picker and usage in comments
---------

Co-authored-by: Charles Bochet <charles@twenty.com>

front/src/testing/mock-data/index.ts

@@ -52,6 +52,11 @@ function filterData<DataT>(
               filterElement.contains.replaceAll('%', '').toLocaleLowerCase(),
             );
         }
+        if (filterElement.in) {
+          const itemValue = item[key as keyof typeof item] as string;
+
+          return filterElement.in.includes(itemValue);
+        }
       }
       return false;
     });