Heatmap: Visualization no longer displaying data when not in "Table view" mode and/or when "Calculate from data" option is set to 'No'

### What happened? When attempting to display a heatmap using frequency (y-axis) & time (x-axis), I am no longer able to get the data to display (I was able to when using Grafana 11.1.3, but am no longer able to in 11.5.2 - I also confirmed I was unable to in 11.3.2 and 11.6.0). I've confirmed that the data I am expecting in QuestDB is there, and that the query I have been using (unchanged in all grafana versions tested against) in the Grafana Heatmap visualization is showing data when toggling on "Table View" when in edit mode. However, when "Table View" is not toggled the heatmap will not populate. I also noticed that when setting the "Calculate from data" to 'Yes' I am able to get data in the heatmap - but nothing shows when the option is set to 'No' (which is what I was doing in 11.1.3 and would like to continu to do). Here is a video of the behavior I am seeing: https://github.com/user-attachments/assets/30396e7d-4343-4608-8bff-04bb27d2656d ### What did you expect to happen? I expected to be able to see my data displayed in the heatmap the same way I was able to see it in Grafana 11.1.3. ### Did this work before? Yes, this worked in 11.1.3. I have confirmed so far that it is not working in 11.3.2, 11.5.2 & 11.6.0. Here is what I was able to see before upgrading from 11.1.3:  ### How do we reproduce it? Refer to attached video. ### Is the bug inside a dashboard panel? Yes. [Dashboard (Heatmap Visualization).txt](https://github.com/user-attachments/files/19508609/Dashboard.Heatmap.Visualization.txt) ### Environment (with versions)? Grafana: 11.3.2, 11.5.2 & 11.6.0 (not working) - 11.1.3 (working) OS: Linux Browser: Chrome & Edge ### Grafana platform? Kubernetes ### Datasource(s)? PostgreSQL/QuestDB