[ML] Adds ES|QL visualizer menu item in Observability's ML left-nav (e…

…lastic#197300)

## Summary

Fixes: elastic#197142

Adds ES|QL visualizer menu item in Observability's ML left-nav.


![image](https://github.com/user-attachments/assets/f705f94a-3f9c-471e-9c41-8e5020881750)


### Checklist

Delete any items that are not applicable to this PR.

- [ ] Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)
- [ ]
[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)
was added for features that require explanation or tutorials
- [ ] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- [ ] [Flaky Test
Runner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1) was
used on any tests changed
- [ ] Any UI touched in this PR is usable by keyboard only (learn more
about [keyboard accessibility](https://webaim.org/techniques/keyboard/))
- [ ] Any UI touched in this PR does not create any new axe failures
(run axe in browser:
[FF](https://addons.mozilla.org/en-US/firefox/addon/axe-devtools/),
[Chrome](https://chrome.google.com/webstore/detail/axe-web-accessibility-tes/lhdoppojpmngadmnindnejefpokejbdd?hl=en-US))
- [ ] If a plugin configuration key changed, check if it needs to be
allowlisted in the cloud and added to the [docker
list](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)
- [ ] This renders correctly on smaller devices using a responsive
layout. (You can test this [in your
browser](https://www.browserstack.com/guide/responsive-testing-on-local-server))
- [ ] This was checked for [cross-browser
compatibility](https://www.elastic.co/support/matrix#matrix_browsers)

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

x-pack/plugins/observability_solution/observability/public/navigation_tree.ts

@@ -325,6 +325,15 @@ export function createNavTree(pluginsStart: ObservabilityPublicPluginsStart) {
                       }
                     ),
                   },
+                  {
+                    link: 'ml:esqlDataVisualizer',
+                    title: i18n.translate(
+                      'xpack.observability.obltNav.ml.data_visualizer.esql_data_visualizer',
+                      {
+                        defaultMessage: 'ES|QL data visualizer',
+                      }
+                    ),
+                  },
                   {
                     link: 'ml:dataDrift',
                     title: i18n.translate(