Integrating Embed and Navigation into single component

What does this MR do and why?

• Use ObservabilityApp component for inline and non-inline embedding
• Extend ObservabilityApp component to handle inline embedding

Screenshots or screen recordings

Inline

Non-inline

How to set up and validate locally

https://gitlab.com/gitlab-org/opstrace/opstrace-ui/-/blob/main/contribute/developer-guide.md#run-gitlab-observability-ui-with-gdk

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.