fix: subscribe stats_collector after Mnesia tables are ready

Backfill ran during init_tables before wait_for_tables, so dirty reads hit {no_exists,user} and crash-looped eventhub on IFT.

src/infra/stats_tops.erl

@@ -81,7 +81,12 @@ ready() ->
 
 foreach_table(Table, Pattern, Fun) ->
   case lists:member(Table, mnesia:system_info(tables)) of
-    true -> lists:foreach(Fun, mnesia:dirty_match_object(Pattern));
+    true ->
+      try lists:foreach(Fun, mnesia:dirty_match_object(Pattern))
+      catch
+        exit:{aborted, {no_exists, _}} -> ok;
+        error:{aborted, {no_exists, _}} -> ok
+      end;
     false -> ok
   end.