Remove deprecated slow epoch boundary methods (backport #21568) (#21595)

* Remove deprecated slow epoch boundary methods (#21568)

(cherry picked from commit 1430b58a6d)

# Conflicts:
#	core/src/replay_stage.rs
#	core/src/tvu.rs
#	core/src/validator.rs
#	local-cluster/src/validator_configs.rs
#	runtime/src/bank.rs
#	runtime/src/stakes.rs

* resolve conflicts

Co-authored-by: Justin Starry <justin@solana.com>

core/src/validator.rs

@@ -154,7 +154,6 @@ pub struct ValidatorConfig {
     pub validator_exit: Arc<RwLock<Exit>>,
     pub no_wait_for_vote_to_start_leader: bool,
     pub accounts_shrink_ratio: AccountShrinkThreshold,
-    pub disable_epoch_boundary_optimization: bool,
 }
 
 impl Default for ValidatorConfig {
@@ -213,7 +212,6 @@ impl Default for ValidatorConfig {
             validator_exit: Arc::new(RwLock::new(Exit::default())),
             no_wait_for_vote_to_start_leader: true,
             accounts_shrink_ratio: AccountShrinkThreshold::default(),
-            disable_epoch_boundary_optimization: false,
         }
     }
 }
@@ -810,7 +808,6 @@ impl Validator {
                 rocksdb_max_compaction_jitter: config.rocksdb_compaction_interval,
                 wait_for_vote_to_start_leader,
                 accounts_shrink_ratio: config.accounts_shrink_ratio,
-                disable_epoch_boundary_optimization: config.disable_epoch_boundary_optimization,
             },
             &max_slots,
             &cost_model,