Use semantically correct bool comparison for some metrics field tests

[msimberg]

Just extracts a minor inconsistency from #853. Also fixes dtype for mask_hdiff.

[Copilot]

Pull Request Overview

This PR updates comparison assertions in two test functions to use exact equality checks instead of the dallclose helper function, with the intent of making these comparisons semantically correct for boolean fields.

• Changed assertions from dallclose to (field == field).all() for two mask fields
• Applied to MASK_PROG_HALO_C in test_factory_mask_bdy_prog_halo_c
• Applied to MASK_HDIFF in test_factory_compute_diffusion_mask_and_coef

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[msimberg]

cscs-ci run default

[github-actions]

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[msimberg]

cscs-ci run default