More logs to verify the correct credential is used by target_experiment.py
#13042
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OSS-Fuzz-Gen experiment cloud build does not use service account.
Meanwhile, its cloud builds fails occasionally due to
Service Unavailable
:This PR prints information about
GOOGLE_APPLICATION_CREDENTIALS
and the credentials used by the cloud build to help debug why service account is not used and if using service account can resolve the 'service unavailable' error.