Tooltip: Improved Heatmap tooltip (#75712)

Co-authored-by: Leon Sorokin <leeoniya@gmail.com>
Co-authored-by: nmarrs <nathanielmarrs@gmail.com>

packages/grafana-schema/src/raw/composable/heatmap/panelcfg/x/HeatmapPanelCfg_types.gen.ts

@@ -133,6 +133,10 @@ export interface HeatmapTooltip {
    * Controls if the tooltip is shown
    */
   show: boolean;
+  /**
+   * Controls if the tooltip shows a color scale in header
+   */
+  showColorScale?: boolean;
   /**
    * Controls if the tooltip shows a histogram of the y-axis values
    */
@@ -264,6 +268,7 @@ export const defaultOptions: Partial<Options> = {
   tooltip: {
     show: true,
     yHistogram: false,
+    showColorScale: false,
   },
 };