message: Remove unused era supervisor code.
diff: @@ -89,7 +89,7 @@ pub struct EraSupervisor<I> {
  /// current one.
  active_eras: HashMap<EraId, Era<I>>,
  secret_signing_key: Arc<SecretKey>,
  - pub(super) public_signing_key: PublicKey,
  + public_signing_key: PublicKey,
  current_era: EraId,
  protocol_config: ProtocolConfig,
  config: Config,
  @@ -114,10 +114,6 @@ pub struct EraSupervisor<I> {
  next_upgrade_activation_point: Option<ActivationPoint>,
  /// If true, the process should stop execution to allow an upgrade to proceed.
  stop_for_upgrade: bool,
  - /// Set to true when InitializeEras is handled.
  - /// TODO: A temporary field. Shouldn't be needed once the Joiner doesn't have a consensus
  - /// component.
  - is_initialized: bool,
  }
  impl<I> Debug for EraSupervisor<I> {
  @@ -175,7 +171,6 @@ where
  next_upgrade_activation_point,
  stop_for_upgrade: false,
  next_executed_height: next_height,
  - is_initialized: false,
  };
  let bonded_eras = era_supervisor.bonded_eras();
  @@ -542,7 +537,6 @@ where
  .entry(self.current_era)
  .or_default()
  .extend(active_era_outcomes);
  - self.is_initialized = true;
  self.next_block_height = self.active_eras[&self.current_era].start_height;
  result_map
  }
  