…ects after 30s

fix #3795

The manually added Java-based migrations. These are not Java-based migrations discovered through classpath scanning and instantiated by Flyway. Instead, these are manually added instances of JavaMigration. This is particularly useful when working with a dependencies, where you may want to instantiate the class and wire up its dependencies.

```java
{
    install(new FlywaydbModule()
        .javaMigrations(new MyMigration(new MyService())
    );
}
```

fix #3796