contracts: Replace cargo feature unstable-interface with config (#12787)

* Replace cargo feature with config

* Update frame/contracts/proc-macro/src/lib.rs

Co-authored-by: Sasha Gryaznov <hi@agryaznov.com>

Co-authored-by: Sasha Gryaznov <hi@agryaznov.com>

substrate/bin/node/runtime/Cargo.toml

@@ -312,9 +312,6 @@ try-runtime = [
 	"pallet-vesting/try-runtime",
 	"pallet-whitelist/try-runtime",
 ]
-# Make contract callable functions marked as __unstable__ available. Do not enable
-# on live chains as those are subject to change.
-contracts-unstable-interface = ["pallet-contracts/unstable-interface"]
 # Force `sp-sandbox` to call into the host resident executor. One still need to make sure
 # that `sc-executor` gets the `wasmer-sandbox` feature which happens automatically when
 # specified on the command line.

substrate/bin/node/runtime/src/lib.rs

@@ -32,7 +32,7 @@ use frame_support::{
 	pallet_prelude::Get,
 	parameter_types,
 	traits::{
-		AsEnsureOriginWithArg, ConstU128, ConstU16, ConstU32, Currency, EitherOfDiverse,
+		AsEnsureOriginWithArg, ConstBool, ConstU128, ConstU16, ConstU32, Currency, EitherOfDiverse,
 		EqualPrivilegeOnly, Everything, Imbalance, InstanceFilter, KeyOwnerProofSystem,
 		LockIdentifier, Nothing, OnUnbalanced, U128CurrencyToVote, WithdrawReasons,
 	},
@@ -1191,6 +1191,7 @@ impl pallet_contracts::Config for Runtime {
 	type AddressGenerator = pallet_contracts::DefaultAddressGenerator;
 	type MaxCodeLen = ConstU32<{ 128 * 1024 }>;
 	type MaxStorageKeyLen = ConstU32<128>;
+	type UnsafeUnstableInterface = ConstBool<false>;
 }
 
 impl pallet_sudo::Config for Runtime {