Flag --incompatible_no_implicit_file_export will break Android Testing in a future Bazel release

Incompatible flag --incompatible_no_implicit_file_export will be enabled by default in a future Bazel release [1], thus breaking Android Testing.

The flag is documented here: https://github.com/bazelbuild/bazel/issues/10225

Please check the following CI builds for build and test results:

* Ubuntu 16.04, OpenJDK 8
* Windows, OpenJDK 8
* macOS, OpenJDK 8
* Ubuntu 18.04, OpenJDK 11

Never heard of incompatible flags before? We have [documentation](https://docs.bazel.build/versions/master/backward-compatibility.html) that explains everything.

If you don't want to receive any future issues for Android Testing or if you have any questions,
please file an issue in https://github.com/bazelbuild/continuous-integration

**Important**: Please do NOT modify the issue title since that might break our tools.

[1] The target release hasn't been determined yet. Our tool will update the issue title once the flag flip has been scheduled.

Inizia esaminando la documentazione di Bazel collegata sui flag incompatibili e i quattro risultati di Buildkite CI per Android Testing. Individua gli errori di build o dei test di Android Testing causati da --incompatible_no_implicit_file_export, quindi verifica che tutte le piattaforme elencate passino con il flag abilitato prima del futuro cambio del valore predefinito.

Scritto dal modello di indicizzazione a partire dal testo della issue.