chore: qualify jdbcMappingContext; expected behaviour for parallel r2dbc usage

[Stefanqn]

avoids following code for parallel r2dbc usage:

@EnableJdbcRepositories(
  repositoryFactoryBeanClass = MixedJdbcRepositoryFactoryBean.class
)
...
class MixedJdbcRepositoryFactoryBean<T extends Repository<S, ID>, S, ID extends Serializable>
  extends JdbcRepositoryFactoryBean<T, S, ID> {

  public MixedJdbcRepositoryFactoryBean(Class<? extends T> repositoryInterface) {
    super(repositoryInterface);
  }

  @Autowired
  public void setMappingContext(@Qualifier("jdbcMappingContext") RelationalMappingContext mappingContext) {
    super.setMappingContext(mappingContext);
  }
}

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[mp911de]

We actually should remove auto wiring on the factory bean altogether and handle the wiring externally.