Unify tooltip options across visualizations (#33892)

* Unify tooltip options across visualizations

* Update tests

* use addTooltipOptions in piechart

Co-authored-by: Oscar Kilhed <oscar.kilhed@grafana.com>

devenv/dev-dashboards/panel-graph/graph-shared-tooltip-cursor-position.json

@@ -81,7 +81,7 @@
           "displayMode": "list",
           "placement": "bottom"
         },
-        "tooltipOptions": {
+        "tooltip": {
           "mode": "single"
         }
       },
@@ -174,7 +174,7 @@
           "displayMode": "list",
           "placement": "bottom"
         },
-        "tooltipOptions": {
+        "tooltip": {
           "mode": "single"
         }
       },
@@ -304,7 +304,7 @@
           "displayMode": "list",
           "placement": "bottom"
         },
-        "tooltipOptions": {
+        "tooltip": {
           "mode": "single"
         }
       },
@@ -410,7 +410,7 @@
           "displayMode": "list",
           "placement": "bottom"
         },
-        "tooltipOptions": {
+        "tooltip": {
           "mode": "single"
         }
       },
@@ -514,7 +514,7 @@
           "displayMode": "list",
           "placement": "bottom"
         },
-        "tooltipOptions": {
+        "tooltip": {
           "mode": "single"
         }
       },