cleanup(generator): do not sort includes for golden files (#7271)
cleanup(generator): do not sort includes for golden files (#7271)

It appears (by experiment) that `DisableFormat: true` does not
imply `SortIncludes: false` for `clang-format`. This means that
a `CompareGeneratedToGolden` test could fail if a `checkers`
build is run between generation and the `generator_integration_test`.
So, explicitly disable the sorting of includes for golden files.
googleapis/google-cloud-cpp,googleapis/google-cloud-cpp,googleapis/google-cloud-cpp,googleapis/google-cloud-cpp