[Java] Handle Flight Tests to gracefully shutdown.

### Describe the bug, including details regarding any error messages, version, and platform.

We have been experiencing a few flaky tests in Flight. And recently this was tracked in another PR https://github.com/apache/arrow/pull/43551#issuecomment-2328024081.

The root cause could be the issue discussed here. Shutting down the servers gracefully in order to release resources is necessary to avoid this flakiness in the tests.

### Component(s)

Java

Comece revisando os relatórios de testes instáveis do Flight e a discussão vinculada em Apache Arrow PR 43551. Identifique os servidores de teste do Flight que retêm recursos e determine como o desligamento gracioso deve ser coordenado. Considera-se concluído quando os servidores liberarem os recursos de forma confiável e a instabilidade de testes relatada estiver resolvida.

Escrita pelo modelo de indexação a partir do texto da issue.