[META] New version of navigation

[SuZhou-Joe]

More context is still WIP

New version of left navigation can help users better focus on the use case or features.

2.16

• [ ] https://github.com/opensearch-project/OpenSearch-Dashboards/issues/7029
• [ ] https://github.com/opensearch-project/OpenSearch-Dashboards/issues/7061
• [ ] https://github.com/opensearch-project/OpenSearch-Dashboards/issues/7073
• [ ] https://github.com/opensearch-project/OpenSearch-Dashboards/issues/7094
• [ ] https://github.com/opensearch-project/OpenSearch-Dashboards/issues/7118
• [ ] https://github.com/opensearch-project/OpenSearch-Dashboards/issues/7131
• [ ] https://github.com/opensearch-project/OpenSearch-Dashboards/issues/7132
• [ ] https://github.com/opensearch-project/OpenSearch-Dashboards/issues/7147
• [ ] https://github.com/opensearch-project/OpenSearch-Dashboards/issues/7148

2.16 -- tracker for plugins

• [ ] https://github.com/opensearch-project/dashboards-observability/pull/1926
• [ ] https://github.com/opensearch-project/dashboards-reporting/pull/369