test: properly order freeing resources in cctest

The `IsolateData` instance is created before the `Environment` instance,
so free in reverse order.

Fixes: #14206
PR-URL: #14749
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>

test/cctest/test_environment.cc

@@ -41,9 +41,9 @@ class EnvironmentTest : public NodeTestFixture {
     }
 
     ~Env() {
-      FreeIsolateData(isolate_data_);
       environment_->CleanupHandles();
       FreeEnvironment(environment_);
+      FreeIsolateData(isolate_data_);
     }
 
     Environment* operator*() const {