tidy up suggestions api (#1699)

Streamlines the suggestions/autocomplete api and removes redundancy. All logic accessing the backend is now in hooks in ui-api.

scm-ui/ui-api/src/index.ts

@@ -32,7 +32,9 @@ export * from "./base";
 export * from "./login";
 export * from "./groups";
 export * from "./users";
+export * from "./suggestions";
 export * from "./userSuggestions";
+export * from "./groupSuggestions";
 export * from "./repositories";
 export * from "./namespaces";
 export * from "./branches";