Add testcase for services with buffer in the response only

[mathias-luedtke]

Description

This PR add a test case that shows that cpplint checks fail for generated code for services that have buffers in their response, but not in the request.
The same issue should happen for actions.

The tests will fail with:

- rosidl_generator_py.cpplint_rosidl_generated_py build/include_order [4] (/ws/build/rosidl_generator_py/rosidl_generator_py/rosidl_generator_py/srv/_get_buffer_s.c:83)
  <<< failure message
    Found C system header after other header. Should be: _get_buffer_s.h, c system, c++ system, other.
  >>>

Is this user-facing behavior change?

No

Did you use Generative AI?

No

Additional Information

This issue was introduced by #250

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[skyegalaxy]

@adbidwai to take a look

[adbidwai]

Hi, I can take a look at this. Thanks!

[fujitatomoya]

I do not think we can take this without fixes, because this generates intentionally red test.

[mathias-luedtke]

I do not think we can take this without fixes, because this generates intentionally red test.

I can add the fix as well, but I need to know which option do you prefer (see #264)