chore(sql): remove disabled ORE block operator files

Remove operators.sql and operator_class.sql from ore_block_u64_8_256 module.
These files were disabled (!REQUIRE) and are no longer needed.

Files removed:
- src/ore_block_u64_8_256/operators.sql
- src/ore_block_u64_8_256/operator_class.sql

Author: tobyhede