Remove AssignmentProviderConfig and use parameters from HostConfiguration instead (#3181)

This PR removes `AssignmentProviderConfig` and uses the corresponding
ondemand parameters from `HostConfiguration` instead. Additionally
`scheduling_lookahead` and all coretime/ondemand related parameters are
extracted in a separate struct - `SchedulerParams`.

The most relevant commit from the PR is [this
one](https://github.com/paritytech/polkadot-sdk/pull/3181/commits/830bc0f5e858944474171bbe33382ad96040b535).

Fixes https://github.com/paritytech/polkadot-sdk/issues/2268

---------

Co-authored-by: command-bot <>

polkadot/runtime/parachains/src/mock.rs

@@ -23,7 +23,7 @@ use crate::{
 	initializer, origin, paras,
 	paras::ParaKind,
 	paras_inherent, scheduler,
-	scheduler::common::{AssignmentProvider, AssignmentProviderConfig},
+	scheduler::common::AssignmentProvider,
 	session_info, shared, ParaId,
 };
 use frame_support::pallet_prelude::*;
@@ -463,10 +463,6 @@ pub mod mock_assigner {
 		pub(super) type MockAssignmentQueue<T: Config> =
 			StorageValue<_, VecDeque<Assignment>, ValueQuery>;
 
-		#[pallet::storage]
-		pub(super) type MockProviderConfig<T: Config> =
-			StorageValue<_, AssignmentProviderConfig<BlockNumber>, OptionQuery>;
-
 		#[pallet::storage]
 		pub(super) type MockCoreCount<T: Config> = StorageValue<_, u32, OptionQuery>;
 	}
@@ -478,12 +474,6 @@ pub mod mock_assigner {
 			MockAssignmentQueue::<T>::mutate(|queue| queue.push_back(assignment));
 		}
 
-		// This configuration needs to be customized to service `get_provider_config` in
-		// scheduler tests.
-		pub fn set_assignment_provider_config(config: AssignmentProviderConfig<BlockNumber>) {
-			MockProviderConfig::<T>::set(Some(config));
-		}
-
 		// Allows for customized core count in scheduler tests, rather than a core count
 		// derived from on-demand config + parachain count.
 		pub fn set_core_count(count: u32) {
@@ -512,17 +502,6 @@ pub mod mock_assigner {
 		// in the mock assigner.
 		fn push_back_assignment(_assignment: Assignment) {}
 
-		// Gets the provider config we set earlier using `set_assignment_provider_config`, falling
-		// back to the on demand parachain configuration if none was set.
-		fn get_provider_config(_core_idx: CoreIndex) -> AssignmentProviderConfig<BlockNumber> {
-			match MockProviderConfig::<T>::get() {
-				Some(config) => config,
-				None => AssignmentProviderConfig {
-					max_availability_timeouts: 1,
-					ttl: BlockNumber::from(5u32),
-				},
-			}
-		}
 		#[cfg(any(feature = "runtime-benchmarks", test))]
 		fn get_mock_assignment(_: CoreIndex, para_id: ParaId) -> Assignment {
 			Assignment::Bulk(para_id)