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/tests/tests.rs

@@ -282,6 +282,12 @@ mod ssz_static {
             .run();
     }
 
+    #[test]
+    fn single_attestation() {
+        SszStaticHandler::<SingleAttestation, MinimalEthSpec>::electra_and_later().run();
+        SszStaticHandler::<SingleAttestation, MainnetEthSpec>::electra_and_later().run();
+    }
+
     #[test]
     fn attester_slashing() {
         SszStaticHandler::<AttesterSlashingBase<MinimalEthSpec>, MinimalEthSpec>::pre_electra()
@@ -880,6 +886,12 @@ fn fork_choice_get_proposer_head() {
     ForkChoiceHandler::<MainnetEthSpec>::new("get_proposer_head").run();
 }
 
+#[test]
+fn fork_choice_deposit_with_reorg() {
+    ForkChoiceHandler::<MinimalEthSpec>::new("deposit_with_reorg").run();
+    // There is no mainnet variant for this test.
+}
+
 #[test]
 fn optimistic_sync() {
     OptimisticSyncHandler::<MinimalEthSpec>::default().run();