Added test for kind namespaces in object explorer page

[alokdangre]

Description

Added test for kind namespaces in 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 kind and namespace selection functionality in the Object Explorer page. The tests validate dropdown interactions, filtering, multi-selection, and resource loading behavior for both namespaced and cluster-scoped Kubernetes resources.

Key Changes

• Added 16 test cases covering kind and namespace selection workflows
• Tests include scenarios for single/multiple selections, filtering, rapid changes, and edge cases
• Utilizes MSW mocking for consistent test data via the 'objectExplorerSuccess' scenario

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[alokdangre]

/cc @btwshivam