Don't send ActiveLeaves from leaves in db on startup in Overseer (#6727)

* Don't send `ActiveLeaves` from leaves in db on startup in Overseer. Wait for fresh leaves instead.

* Don't pass initial set of leaves to Overseer

* Fix compilation error in subsystem-test-helpers

polkadot/node/service/src/overseer.rs

@@ -34,8 +34,8 @@ pub use polkadot_overseer::{
 	HeadSupportsParachains,
 };
 use polkadot_overseer::{
-	metrics::Metrics as OverseerMetrics, BlockInfo, InitializedOverseerBuilder, MetricsTrait,
-	Overseer, OverseerConnector, OverseerHandle, SpawnGlue,
+	metrics::Metrics as OverseerMetrics, InitializedOverseerBuilder, MetricsTrait, Overseer,
+	OverseerConnector, OverseerHandle, SpawnGlue,
 };
 
 use polkadot_primitives::runtime_api::ParachainHost;
@@ -81,8 +81,6 @@ where
 	RuntimeClient::Api: ParachainHost<Block> + BabeApi<Block> + AuthorityDiscoveryApi<Block>,
 	Spawner: 'static + SpawnNamed + Clone + Unpin,
 {
-	/// Set of initial relay chain leaves to track.
-	pub leaves: Vec<BlockInfo>,
 	/// The keystore to use for i.e. validator keys.
 	pub keystore: Arc<LocalKeystore>,
 	/// Runtime client generic, providing the `ProvieRuntimeApi` trait besides others.
@@ -131,7 +129,6 @@ where
 /// with all default values.
 pub fn prepared_overseer_builder<Spawner, RuntimeClient>(
 	OverseerGenArgs {
-		leaves,
 		keystore,
 		runtime_client,
 		parachains_db,
@@ -309,11 +306,6 @@ where
 			Metrics::register(registry)?,
 		))
 		.chain_selection(ChainSelectionSubsystem::new(chain_selection_config, parachains_db))
-		.leaves(Vec::from_iter(
-			leaves
-				.into_iter()
-				.map(|BlockInfo { hash, parent_hash: _, number }| (hash, number)),
-		))
 		.activation_external_listeners(Default::default())
 		.span_per_active_leaf(Default::default())
 		.active_leaves(Default::default())