add logic so that the group sort order for dashboard panel list might…

… be inferred from the DOM (elastic#191828)

## Summary

Adds data-attribute so that the group sort order for panel type groups
for dashboard panels can be inferred without specifically hunting
through the codebase to figure out what each group's sort order might
be. Prompted by the discussion
[here](https://elastic.slack.com/archives/CK6KAJD0U/p1724176646394949)
on slack.

Furthermore, the Annotations and Navigation group has been assigned an
order value such that it follows right after visualisations, like so;

<img width="393" alt="Screenshot 2024-08-30 at 16 43 01"
src="https://github.com/user-attachments/assets/567ad6c5-eb0c-478e-89d0-2261876fd428">



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### Checklist

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- [ ] [Unit or functional
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were updated or added to match the most common scenarios
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### Risk Matrix

Delete this section if it is not applicable to this PR.

Before closing this PR, invite QA, stakeholders, and other developers to
identify risks that should be tested prior to the change/feature
release.

When forming the risk matrix, consider some of the following examples
and how they may potentially impact the change:

| Risk | Probability | Severity | Mitigation/Notes |

|---------------------------|-------------|----------|-------------------------|
| Multiple Spaces&mdash;unexpected behavior in non-default Kibana Space.
| Low | High | Integration tests will verify that all features are still
supported in non-default Kibana Space and when user switches between
spaces. |
| Multiple nodes&mdash;Elasticsearch polling might have race conditions
when multiple Kibana nodes are polling for the same tasks. | High | Low
| Tasks are idempotent, so executing them multiple times will not result
in logical error, but will degrade performance. To test for this case we
add plenty of unit tests around this logic and document manual testing
procedure. |
| Code should gracefully handle cases when feature X or plugin Y are
disabled. | Medium | High | Unit tests will verify that any feature flag
or plugin combination still results in our service operational. |
| [See more potential risk
examples](https://github.com/elastic/kibana/blob/main/RISK_MATRIX.mdx) |


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- [ ] This was checked for breaking API changes and was [labeled
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---------

Co-authored-by: Elastic Machine <[email protected]>

src/plugins/dashboard/public/dashboard_app/top_nav/add_new_panel/dashboard_panel_selection_flyout.tsx

@@ -186,9 +186,13 @@ export const DashboardPanelSelectionListFlyout: React.FC<
               >
                 {panelsSearchResult?.some(({ isDisabled }) => !isDisabled) ? (
                   panelsSearchResult.map(
-                    ({ id, title, items, isDisabled, ['data-test-subj']: dataTestSubj }) =>
+                    ({ id, title, items, isDisabled, ['data-test-subj']: dataTestSubj, order }) =>
                       !isDisabled ? (
-                        <EuiFlexItem key={id} data-test-subj={dataTestSubj}>
+                        <EuiFlexItem
+                          key={id}
+                          data-test-subj={dataTestSubj}
+                          data-group-sort-order={order}
+                        >
                           <EuiTitle id={`${id}-group`} size="xxs">
                             {typeof title === 'string' ? <h3>{title}</h3> : title}
                           </EuiTitle>

src/plugins/embeddable/public/lib/embeddables/common/constants.ts

@@ -10,20 +10,13 @@ import { i18n } from '@kbn/i18n';
 import { UiActionsPresentableGroup } from '@kbn/ui-actions-plugin/public';
 
 export const COMMON_EMBEDDABLE_GROUPING: { [key: string]: UiActionsPresentableGroup<unknown> } = {
-  legacy: {
-    id: 'legacy',
-    getDisplayName: () =>
-      i18n.translate('embeddableApi.common.constants.grouping.legacy', {
-        defaultMessage: 'Legacy',
-      }),
-    order: -2,
-  },
   annotation: {
     id: 'annotation-and-navigation',
     getDisplayName: () =>
       i18n.translate('embeddableApi.common.constants.grouping.annotations', {
         defaultMessage: 'Annotations and Navigation',
       }),
+    order: 900, // This is the order of the group in the context menu
   },
   other: {
     id: 'other',
@@ -32,6 +25,14 @@ export const COMMON_EMBEDDABLE_GROUPING: { [key: string]: UiActionsPresentableGr
         defaultMessage: 'Other',
       }),
     getIconType: () => 'empty',
-    order: -1,
+    order: -1, // Given an item that doesn't specify a group is assigned zero, this forces other to come after all intentionally grouped section
+  },
+  legacy: {
+    id: 'legacy',
+    getDisplayName: () =>
+      i18n.translate('embeddableApi.common.constants.grouping.legacy', {
+        defaultMessage: 'Legacy',
+      }),
+    order: -2, // Given an item that doesn't specify a group is assigned zero, this forces it to the bottom of the list
   },
 };