chore: Update 2d field data test.

[prmukherj]

Context

This particular 2d field data test was using the deprecated interface.

Change Summary

Updated the test to use new interface.

Impact

Only test is updated with no user facing code updates.

[1349379]

[Copilot]

Pull Request Overview

This PR updates a 2D field data test to use the new interface for field data retrieval, replacing deprecated methods with the current API pattern. The changes maintain test functionality while modernizing the code to follow current best practices.

Key Changes:

• Replaced direct get_scalar_field_data(), get_surface_data(), get_vector_field_data(), and get_pathlines_field_data() method calls with request-based pattern using get_field_data().
• Updated data access patterns from dictionary-based to attribute-based access (e.g., .vertices, .face_centroids, .connectivity).

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