Improvements to Deneb store upon review (#4693)

* Start testing blob pruning

* Get rid of unnecessary orphaned blob column

* Make random blob tests deterministic

* Test for pruning being blocked by finality

* Fix bugs and test fork boundary

* A few more tweaks to pruning conditions

* Tweak oldest_blob_slot semantics

* Test margin pruning

* Clean up some terminology and lints

* Schema migrations for v18

* Remove FIXME

* Prune blobs on finalization not every slot

* Fix more bugs + tests

* Address review comments

beacon_node/http_api/src/database.rs

@@ -10,11 +10,13 @@ pub fn info<T: BeaconChainTypes>(
     let split = store.get_split_info();
     let config = store.get_config().clone();
     let anchor = store.get_anchor_info();
+    let blob_info = store.get_blob_info();
 
     Ok(DatabaseInfo {
         schema_version: CURRENT_SCHEMA_VERSION.as_u64(),
         config,
         split,
         anchor,
+        blob_info,
     })
 }