configuration: Consistency checks for PVF pre-checking (#4580)

As was suggested by Alexander Popiak [here][comment], this commit
checks the consistency of the configuration.

[comment]:
https://github.com/paritytech/polkadot/pull/4420#discussion_r764796519

polkadot/node/test/service/src/chain_spec.rs

@@ -171,6 +171,7 @@ fn polkadot_testnet_genesis(
 				chain_availability_period: 4,
 				thread_availability_period: 4,
 				no_show_slots: 10,
+				minimum_validation_upgrade_delay: 5,
 				..Default::default()
 			},
 		},