Remove schema migrations for v28 and earlier (#9031)

With LH v8.1.3 supporting Fulu-on-Gnosis, we no longer need these DB migrations. All Lighthouse nodes running in prod will soon be updated to LH v8.0.0+ and schema v28+.

This PR helps with Gloas fork choice changes, by allowing us to avoid updating old schema migrations when adding V29 for Gloas:

- https://github.com/sigp/lighthouse/pull/9025


  


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

beacon_node/store/src/lib.rs

@@ -77,11 +77,7 @@ pub trait KeyValueStore<E: EthSpec>: Sync + Send + Sized + 'static {
     fn compact(&self) -> Result<(), Error> {
         // Compact state and block related columns as they are likely to have the most churn,
         // i.e. entries being created and deleted.
-        for column in [
-            DBColumn::BeaconState,
-            DBColumn::BeaconStateHotSummary,
-            DBColumn::BeaconBlock,
-        ] {
+        for column in [DBColumn::BeaconStateHotSummary, DBColumn::BeaconBlock] {
             self.compact_column(column)?;
         }
         Ok(())