Reject non-finite inputs in hypertoroidal angular_error

[FlorianPfaff]

Problem

AbstractHypertoroidalDistribution.angular_error rejected NaN inputs but not +inf or -inf. Periodic reduction of infinite angles produces a non-finite result, so invalid input could silently propagate as an invalid angular error.

Fix

• validate both angle inputs with the backend-neutral isfinite API
• reject NaN, +inf, and -inf consistently before modulo reduction
• add regression coverage for all three non-finite values in both alpha and beta

Testing

The regression test is backend-neutral. The repository CI matrix will exercise it under the configured NumPy, JAX, and PyTorch jobs.

[github-actions]

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[FlorianPfaff]

Superseded by #5462. #5462 contains the same isfinite/backend-any finite-angle validation in abstract_hypertoroidal_distribution.py, carries equivalent non-finite regression coverage, and additionally fixes the default MH start point for distributions without a unique mean direction. Closing the narrower duplicate avoids conflicting edits to the same implementation hunk.