Update EF tests to spec v1.5.0-beta.2 (#6958)

Update spec tests for recent v1.5.0-beta.2 release. There are no substantial changes for Electra and earlier, and the Fulu test updates to be made are tracked here:

- https://github.com/sigp/lighthouse/issues/6957


  - Add `SingleAttestation` SSZ tests
- Add new `deposit_with_reorg` fork choice tests
- Update tag to v1.5.0-beta.2
- Ignore Fulu tests

testing/ef_tests/src/handler.rs

@@ -680,6 +680,11 @@ impl<E: EthSpec + TypeName> Handler for ForkChoiceHandler<E> {
             return false;
         }
 
+        // Deposit tests exist only after Electra.
+        if self.handler_name == "deposit_with_reorg" && !fork_name.electra_enabled() {
+            return false;
+        }
+
         // These tests check block validity (which may include signatures) and there is no need to
         // run them with fake crypto.
         cfg!(not(feature = "fake_crypto"))