Preserve UltraCompressed mode across Clone for BabyBearPoseidon2

[radik878]

ultra_compressed() is marked as Compressed, but Clone does not preserve “ultra”
In the ultra_compressed() constructor, the config_type field is set to Compressed. The Clone implementation only distinguishes between Default and Compressed; “ultra” is not present there. As a result, cloning an ultra_compressed config silently downgraded it to compressed (log_blowup 3 → 2). This change:

• Introduces a dedicated UltraCompressed enum variant.
• Sets config_type to UltraCompressed in ultra_compressed().
• Extends Clone to return ultra_compressed() when config_type is UltraCompressed.
• Adds a unit test asserting that cloning an ultra config preserves log_blowup == 3.

This ensures consistent behavior when configs are cloned in utilities or helper flows.