Added tests for object explorer page

[alokdangre]

Description

Added tests for object explorer page

Related Issue

Fixes #<issue_number>

Changes Made

• Updated ...
• Refactored ...
• Fixed ...
• Added tests for ...

Checklist

Please ensure the following before submitting your PR:

• I have reviewed the project's contribution guidelines.
• I have written unit tests for the changes (if applicable).
• I have updated the documentation (if applicable).
• I have tested the changes locally and ensured they work as expected.
• My code follows the project's coding standards.

Screenshots or Logs (if applicable)

Additional Notes

[kubestellar-prow]

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[Copilot]

Pull Request Overview

This PR adds comprehensive end-to-end tests for the Object Explorer page, covering navigation, UI elements, filtering functionality, and user interactions.

Key changes:

• Added 11 new test cases covering object explorer page functionality
• Tests include navigation, filter toggling, quick search, auto-refresh, and filter chip management
• Uses MSW (Mock Service Worker) for API response mocking

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