[Test] Stop containers before checking ASAN logs

[Test] Stop containers before checking ASAN logs

ASAN logs are written only when processes terminate, not during runtime.
Need to stop Docker containers first to flush ASAN logs, then check them.

Order of steps:
1. Run integration test
2. Collect Docker logs (while running)
3. Stop Docker Compose (triggers ASAN log flush)
4. Check AddressSanitizer logs (now available)
5. Upload artifacts