test: cleanup handles in test_environment

The test fixtures create multiple node::Environments that all use the
uv_default_loop(), and since the test does not clean up the handles
created by Environment::Start(), the default libuv loop structure
contains dangling pointers after the first Environment is freed,
which then means that creating new handles leads to memory corruption.

PR-URL: #12621
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

test/cctest/test_environment.cc

@@ -42,6 +42,7 @@ class EnvironmentTest : public NodeTestFixture {
 
     ~Env() {
       FreeIsolateData(isolate_data_);
+      environment_->CleanupHandles();
       FreeEnvironment(environment_);
     }