Streamline Kibana dashboard navigation with the Links panel

Introduces the new 'Links panel' in Kibana dashboards, allowing users to organize and navigate between related dashboards. This panel addresses limitations of the previous Markdown text panel by preserving context (filters, queries) during navigation and resolving cross-space referencing issues. It also introduces a 'Save to library' option for reusing the panel across multiple dashboards and allows for customization of link display (vertical/horizontal, custom text, emojis) and context preservation behavior.