Tests for BridgeHub(s) <> remote GRANDPA chain (#2692)

So far the `bridge-hub-test-utils` contained a tests set for testing
BridgeHub runtime that is bridging with the remote **parachain**. But we
have https://github.com/paritytech/polkadot-sdk/pull/2540 coming, which
would add Rococo <> Bulletin chain bridge (where Bulletin = standalone
chain that is using GRANDPA finality). Then it'll be expanded to
Polkadot BH as well.

So this PR adds the same set of tests to the `bridge-hub-test-utils`,
but for the case when remote chain is the chain with GRANDPA finality.
There's a lot of changes in this PR - I'll describe some:
- I've added `BasicParachainRuntime` trait to decrease number of lines
we need to add to `where` clause. Could revert, but imo it is useful;
- `cumulus/parachains/runtimes/bridge-hubs/test-utils/src/test_data` is
a submodule for generating test data for the test sets.
`from_parachain.rs` is used in tests for the case when remote chain is a
parachain, `from_grandpa_chain.rs` - for the bridges with remote GRANDPA
chains. `mod.rs` has some code, shared by both types of tests;
- `cumulus/parachains/runtimes/bridge-hubs/test-utils/src/test_data` is
a submodule with all test cases. The `mod.rs` has tests, suitable for
all cases. There's also `wth_parachain.rs` and `with_grandpa_chain.rs`
with the same meaning as above;
- I've merged the "core" code of two previous tests -
`relayed_incoming_message_works` and `complex_relay_extrinsic_works`
into one single `relayed_incoming_message_works` test. So now we are
always constructing extrinsics and are dispatching them using executive
module (meaning all signed extensions are also tested).

New test set is used here:
https://github.com/paritytech/polkadot-sdk/pull/2540. Once this PR is
merged, I'll merge that other PR with master to remove duplicate
changes.

I'm also planning to cleanup generic constraints + remove some
unnecessary assumptions about used chains in a follow-up PRs. But for
now I think this PR has enough changes, so don't want to complicate it
even more.

---

Breaking changes for the code that have used those tests before:
- the `construct_and_apply_extrinsic` callback now accepts the
`RuntimeCall` instead of the `pallet_utility::Call`;
- the `construct_and_apply_extrinsic` now may be called multiple times
for the single test, so make sure the `frame_system::CheckNonce` is
correctly constructed;
- all previous tests have been moved from
`bridge_hub_test_utils::test_cases` to
`bridge_hub_test_utils::test_cases::from_parachain` module;
- there are several changes in test arguments - please refer to
https://github.com/paritytech/polkadot-sdk/compare/sv-tests-for-bridge-with-remote-grandpa-chain?expand=1#diff-79a28d4d3e1749050341c2424f00c4c139825b1a20937767f83e58b95166735c
for details.

cumulus/parachains/runtimes/test-utils/src/lib.rs

@@ -114,14 +114,34 @@ impl<Runtime: frame_system::Config + pallet_balances::Config + pallet_session::C
 	}
 }
 
-// Basic builder based on balances, collators and pallet_sessopm
-pub struct ExtBuilder<
-	Runtime: frame_system::Config
+/// A set of traits for a minimal parachain runtime, that may be used in conjunction with the
+/// `ExtBuilder` and the `RuntimeHelper`.
+pub trait BasicParachainRuntime:
+	frame_system::Config
+	+ pallet_balances::Config
+	+ pallet_session::Config
+	+ pallet_xcm::Config
+	+ parachain_info::Config
+	+ pallet_collator_selection::Config
+	+ cumulus_pallet_parachain_system::Config
+{
+}
+
+impl<T> BasicParachainRuntime for T
+where
+	T: frame_system::Config
 		+ pallet_balances::Config
 		+ pallet_session::Config
 		+ pallet_xcm::Config
-		+ parachain_info::Config,
-> {
+		+ parachain_info::Config
+		+ pallet_collator_selection::Config
+		+ cumulus_pallet_parachain_system::Config,
+	ValidatorIdOf<T>: From<AccountIdOf<T>>,
+{
+}
+
+/// Basic builder based on balances, collators and pallet_session.
+pub struct ExtBuilder<Runtime: BasicParachainRuntime> {
 	// endowed accounts with balances
 	balances: Vec<(AccountIdOf<Runtime>, BalanceOf<Runtime>)>,
 	// collators to test block prod
@@ -135,14 +155,7 @@ pub struct ExtBuilder<
 	_runtime: PhantomData<Runtime>,
 }
 
-impl<
-		Runtime: frame_system::Config
-			+ pallet_balances::Config
-			+ pallet_session::Config
-			+ pallet_xcm::Config
-			+ parachain_info::Config,
-	> Default for ExtBuilder<Runtime>
-{
+impl<Runtime: BasicParachainRuntime> Default for ExtBuilder<Runtime> {
 	fn default() -> ExtBuilder<Runtime> {
 		ExtBuilder {
 			balances: vec![],
@@ -155,14 +168,7 @@ impl<
 	}
 }
 
-impl<
-		Runtime: frame_system::Config
-			+ pallet_balances::Config
-			+ pallet_session::Config
-			+ pallet_xcm::Config
-			+ parachain_info::Config,
-	> ExtBuilder<Runtime>
-{
+impl<Runtime: BasicParachainRuntime> ExtBuilder<Runtime> {
 	pub fn with_balances(
 		mut self,
 		balances: Vec<(AccountIdOf<Runtime>, BalanceOf<Runtime>)>,
@@ -198,12 +204,7 @@ impl<
 		self
 	}
 
-	pub fn build(self) -> sp_io::TestExternalities
-	where
-		Runtime:
-			pallet_collator_selection::Config + pallet_balances::Config + pallet_session::Config,
-		ValidatorIdOf<Runtime>: From<AccountIdOf<Runtime>>,
-	{
+	pub fn build(self) -> sp_io::TestExternalities {
 		let mut t = frame_system::GenesisConfig::<Runtime>::default().build_storage().unwrap();
 
 		pallet_xcm::GenesisConfig::<Runtime> {