Gloas cold DB (#8991)

Closes:

- https://github.com/sigp/lighthouse/issues/8958


  - Update the `HotColdStore` to handle storage of cold states.
- Update `BeaconSnapshot` to hold the execution envelope. This is required to make `chain_dump`-related checks sane, and will be generally useful (see: https://github.com/sigp/lighthouse/issues/8956).
- Bug fix in the `BlockReplayer` for the case where the starting state is already `Full` (we should not try to apply another payload). This happens on the cold DB path because we try to replay from the closest cached state (which is often full).
- Update `test_gloas_hot_state_hierarchy` to cover the cold DB migration.


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

Co-Authored-By: Michael Sproul <michaelsproul@users.noreply.github.com>

beacon_node/beacon_chain/src/builder.rs

@@ -358,6 +358,7 @@ where
         Ok((
             BeaconSnapshot {
                 beacon_block_root,
+                execution_envelope: None,
                 beacon_block: Arc::new(beacon_block),
                 beacon_state,
             },
@@ -616,8 +617,10 @@ where
                 .map_err(|e| format!("Failed to initialize data column info: {:?}", e))?,
         );
 
+        // TODO(gloas): add check that checkpoint state is Pending
         let snapshot = BeaconSnapshot {
             beacon_block_root: weak_subj_block_root,
+            execution_envelope: None,
             beacon_block: Arc::new(weak_subj_block),
             beacon_state: weak_subj_state,
         };
@@ -800,6 +803,7 @@ where
 
         let mut head_snapshot = BeaconSnapshot {
             beacon_block_root: head_block_root,
+            execution_envelope: None,
             beacon_block: Arc::new(head_block),
             beacon_state: head_state,
         };