Enable logs for error message in call_op_set.h. (#31177)
Enable logs for error message in call_op_set.h. (#31177)

* Enable logs for error message in call_op_set.h. 

The `gpr_log` was commented out from call_op_set.h at PR: https://github.com/grpc/grpc/pull/20681, because of the undefined error. It is probably just missing the header file, so adding the `gpr_log` back.

* Automated change: Fix sanity tests (#31178)

Co-authored-by: nanahpang <a0bbab73029af88e8c85a8592f08eb8415312d6f@users.noreply.github.com>

Co-authored-by: github-actions[bot] <17973dcf2e10b67f63417c88ca4c460b2c9439f2@users.noreply.github.com>
Co-authored-by: nanahpang <a0bbab73029af88e8c85a8592f08eb8415312d6f@users.noreply.github.com>
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