core: stop chain when tests are finished (#27660)

core (blockchain_test): add chain.Stop() to tests

core/blockchain_test.go

@@ -4129,6 +4129,7 @@ func testCreateThenDelete(t *testing.T, config *params.ChainConfig) {
 	if err != nil {
 		t.Fatalf("failed to create tester chain: %v", err)
 	}
+	defer chain.Stop()
 	// Import the blocks
 	for _, block := range blocks {
 		if _, err := chain.InsertChain([]*types.Block{block}); err != nil {
@@ -4215,6 +4216,7 @@ func TestTransientStorageReset(t *testing.T) {
 	if err != nil {
 		t.Fatalf("failed to create tester chain: %v", err)
 	}
+	defer chain.Stop()
 	// Import the blocks
 	if _, err := chain.InsertChain(blocks); err != nil {
 		t.Fatalf("failed to insert into chain: %v", err)
@@ -4309,6 +4311,7 @@ func TestEIP3651(t *testing.T) {
 	if err != nil {
 		t.Fatalf("failed to create tester chain: %v", err)
 	}
+	defer chain.Stop()
 	if n, err := chain.InsertChain(blocks); err != nil {
 		t.Fatalf("block %d: failed to insert into chain: %v", n, err)
 	}