Gloas consensus: epoch processing, block signature verification, more tests (#8808)

- [x] Implement `process_builder_pending_payments` in epoch processing for Gloas. Enable the new EF tests for this sub-component as well.
- [x] Update `include_all_signatures_except_proposal` for Gloas to safely include the execution payload bid signature (this was an omission in the previous bid PR).
- [x] Enable Gloas for _all_ remaining EF tests by default. They all pass with the exception of the finality tests (see below).


Co-Authored-By: Michael Sproul <michael@sigmaprime.io>

Co-Authored-By: Eitan Seri- Levi <eserilev@gmail.com>

consensus/state_processing/src/per_slot_processing.rs

@@ -14,6 +14,7 @@ pub enum Error {
     EpochProcessingError(EpochProcessingError),
     ArithError(ArithError),
     InconsistentStateFork(InconsistentFork),
+    BitfieldError(ssz::BitfieldError),
 }
 
 impl From<ArithError> for Error {
@@ -22,6 +23,12 @@ impl From<ArithError> for Error {
     }
 }
 
+impl From<ssz::BitfieldError> for Error {
+    fn from(e: ssz::BitfieldError) -> Self {
+        Self::BitfieldError(e)
+    }
+}
+
 /// Advances a state forward by one slot, performing per-epoch processing if required.
 ///
 /// If the root of the supplied `state` is known, then it can be passed as `state_root`. If
@@ -48,6 +55,18 @@ pub fn per_slot_processing<E: EthSpec>(
         None
     };
 
+    // Unset the next payload availability
+    if state.fork_name_unchecked().gloas_enabled() {
+        let next_slot_index = state
+            .slot()
+            .as_usize()
+            .safe_add(1)?
+            .safe_rem(E::slots_per_historical_root())?;
+        state
+            .execution_payload_availability_mut()?
+            .set(next_slot_index, false)?;
+    }
+
     state.slot_mut().safe_add_assign(1)?;
 
     // Process fork upgrades here. Note that multiple upgrades can potentially run