Expose analytics dashboard panel tooltip field to frontend

What does this MR do and why?

Includes tooltip field in customizable dashboard GraphQL query and passes it down from AnalyticsDashboard component to AnalyticsDashboardPanel component. Builds on backend implementation from !199790 (merged) and !200835 (merged)

References

• #550270 (closed)
• !199790 (merged)
• !200835 (merged)

Screenshots or screen recordings

Valid tooltip	Invalid tooltip

How to set up and validate locally

1. Please make sure that you're on the GitLab Ultimate plan (if necessary, request a license).
2. Visit any group/project, then navigate to Analyze > Analytics dashboards in the menu
3. Select Value Streams Dashboard from the list
4. Verify that you are able to configure a panel's tooltip via the dashboard's YAML file and that it's rendering correctly by applying the following patch:

diff --git a/ee/lib/gitlab/analytics/value_stream_dashboard/dashboards/value_streams_dashboard.yaml b/ee/lib/gitlab/analytics/value_stream_dashboard/dashboards/value_streams_dashboard.yaml
index 73b6e8e281116..de30a438ec4b3 100644
--- a/ee/lib/gitlab/analytics/value_stream_dashboard/dashboards/value_streams_dashboard.yaml
+++ b/ee/lib/gitlab/analytics/value_stream_dashboard/dashboards/value_streams_dashboard.yaml
@@ -12,6 +12,9 @@ panels:
       height: 1
     options: {}
   - visualization: vsd_lifecycle_metrics_table
+    tooltip:
+      description: "This is an example tooltip. %{linkStart}Learn more%{linkEnd}."
+      descriptionLink: "https://docs.gitlab.com/user/analytics/value_streams_dashboard"
     title: 'Lifecycle metrics for the %{namespaceName} %{namespaceType}'
     gridAttributes:
       yPos: 1

MR acceptance checklist

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Related to #550270 (closed)