Update event filters naming and add sub label filter (#3194)

* Use default names so filters are more clear

* Add endpoint to get list of sub labels inside DB

* Fix crash on no internet

* Cleanups for sub_label http

* Add sub label selector to events UI

* Add event filtering for sub label

* Formatting files

* Reduce size of filters to fit on one line

* Add handler for tests

* Remove unused imports

* Only show the sub labels filter when there are sub labels in the DB

* Fix tests

* Use distinct instead of group_by

* Formatting

* Cleanup event logic

web/config/handlers.js

@@ -72,4 +72,13 @@ export const handlers = [
       )
     );
   }),
+  rest.get(`${API_HOST}api/sub_labels`, (req, res, ctx) => {
+    return res(
+      ctx.status(200),
+      ctx.json([
+        'one',
+        'two',
+      ])
+    );
+  }),
 ];