[FEAT] MLRun Navbar Redesign

[amit-noy]

📝 Description

This PR implements the redesigned MLRun navbar according to the Figma specifications. The new design uses Shadcn UI components and Tailwind CSS.

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🛠️ Changes Made

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✅ Checklist

• I have given the PR a well-structured title describing the domain and the specific change that was made
• I tested the changes in the browser (locally or via preview build)
• I confirmed that existing tests pass
• I added or updated unit / integration tests (if needed)
• I checked that this change doesn’t introduce new console warnings or lint / formatting errors
• I updated the relevant Jira ticket with the appropriate details and status

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🔗 References

• Related ticket / issue: https://iguazio.atlassian.net/browse/ML-11729
• Figma / design spec: https://www.figma.com/design/YrZgmH5kOTcJyy6hTyiGhH/%F0%9F%A6%8E-Shell---Admin?node-id=2016-77394&p=f&t=0I6k4N68w3wDSub5-0
• Documentation:

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🚨 Potentially Breaking Changes

• Yes
• No

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Includes DRC change

• Yes
• No

If yes -> requires bump NPM version

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🔍 Additional Notes

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📸 Screenshots / Demos

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