e2e/runtime/runtime-dynamic: Ensure nodes are eligible for election

Since the PVSS random beacon nodes may be ineligible for committee election on
first registration if they register after the commit phase. This adds an extra
epoch transition to the E2E test.

go/oasis-test-runner/scenario/e2e/runtime/runtime_dynamic.go

@@ -250,6 +250,12 @@ func (sc *runtimeDynamicImpl) Run(childEnv *env.Env) error { // nolint: gocyclo
 		}
 	}
 
+	// Perform an epoch transition to make sure all nodes are eligible. They may not be eligible
+	// if they have registered after the beacon commit phase.
+	if err := sc.epochTransition(ctx); err != nil {
+		return err
+	}
+
 	for i := 0; i < 5; i++ {
 		// Perform another epoch transition to elect compute runtime committees.
 		if err := sc.epochTransition(ctx); err != nil {
@@ -361,6 +367,12 @@ func (sc *runtimeDynamicImpl) Run(childEnv *env.Env) error { // nolint: gocyclo
 		}
 	}
 
+	// Perform an epoch transition to make sure all nodes are eligible. They may not be eligible
+	// if they have registered after the beacon commit phase.
+	if err = sc.epochTransition(ctx); err != nil {
+		return err
+	}
+
 	// Epoch transition.
 	if err = sc.epochTransition(ctx); err != nil {
 		return err