@Override protected boolean initializeStoragePerTest() {
    return true;
  }
Base heavy tests for {@link SpanStore} implementations that support dependency aggregation.
Subtypes should create a connection to a real backend, even if that backend is in-process.

<p>As these tests create a lot of data, implementations may wish to isolate them from other
integration tests such as {@link ITDependencies}
zipkin-tests/src/main/java/zipkin2/storage/ITDependenciesHeavy.java