[SNAPPY] Enable only selected shapes of UniformRefinement

[piotrkluba]

Note

Medium Risk
Adds new snappy-specific validation rules for UniformRefinement (including volume refinements projected to the surface) and extends translation coverage to include spherical refinement volumes; may reject previously-accepted inputs or change validation timing for snappy workflows.

Overview
Tightens snappyHexMesh support for UniformRefinement by enforcing shape and parameter restrictions: only Box/Cylinder/Sphere entities are allowed in snappy contexts, and projected refinements now reject rotated boxes and hollow cylinders (shared via validate_snappy_uniform_refinement_entities).

Extends validation to cover VolumeMeshingParams refinements when project_to_surface is enabled (or defaulted) so volume-side refinements that affect the surface mesh are checked consistently. Updates tests and translator fixtures to cover Sphere-based coupled refinements, including a new reference JSON.

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