feat: improved embed navigation APIs

[AdityaHegde]

We have events for navigation from one dashboard to other. This adds events to control navigation,

• Add navigateBack/navigateForward to take the user back and forward within the iframe.
• Add navigateToDashboard to take the user to a specific dashboard.

Checklist:

• Covered by tests
• Ran it and it works as intended
• Reviewed the diff before requesting a review
• Checked for unhandled edge cases
• Linked the issues it closes
• Checked if the docs need to be updated. If so, create a separate Linear DOCS issue
• Intend to cherry-pick into the release branch
• I'm proud of this work!