Dashboards (live): large time ranges will reduce panel update frequency, but not data density

### What happened? https://github.com/user-attachments/assets/97ce3d04-5ceb-49f2-9869-37ba95b6609f With short time ranges the updates come in immediately. Above 5 minutes however it seems like the "refresh" rate decreases to the point where at 30 minute range it takes a while for the data to start showing up. What's weird, though, is that all the data points seem to be retained and displayed – there is no aggregation or data loss going on (as far as I can tell). Its just that (in this sine wave example) at a certain range you simply see large chunks of the wave showing up at once. ### What did you expect to happen? Since the data points are all being retained, just show them immediately like is done for short time ranges. ### Did this work before? No idea. ### How do we reproduce it? 1.Set up an MQTT data source with some test data that's produced every, say, 500ms (ideally something that has a recognizable shape such as the sine wave); 2.Construct a panel displaying that test data; 3.Check time ranges of 1 minute, 5 minutes, 30 minutes, 3 hours. ### Is the bug inside a dashboard panel? _No response_ ### Environment (with versions)? Grafana: v12.2.0 OS: NixOS Browser: Firefox ### Grafana platform? A package manager (APT, YUM, BREW, etc.) ### Datasource(s)? MQTT