tests: Fill fuzzing coverage gaps for functions in consensus/validation.h
tests: Fill fuzzing coverage gaps for functions in consensus/validation.h

Former-commit-id: 5ecff98befc7b96a612595d3aa9dd98d7d9a0b32
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin