Add TaskInstance state to TI Tooltip to be colour-blind friendlier (#8910)

Currently there is no way to determine the state of a TaskInstance in the graph view or tree view for people with colour blindness

Approximately 4.5% of people experience some form of colour vision deficiency

airflow/www/static/js/task-instances.js

@@ -61,6 +61,9 @@ function generateTooltipDateTimes(startDate, endDate, dagTZ) {
 
 export default function tiTooltip(ti, {includeTryNumber = false} = {}) {
   let tt = '';
+  if (ti.state !== undefined) {
+    tt += `<strong>Status:</strong> ${escapeHtml(ti.state)}<br><br>`;
+  }
   if (ti.task_id !== undefined) {
     tt += `Task_id: ${escapeHtml(ti.task_id)}<br>`;
   }