iam.cloud-client.snippets.quickstart_test: test_quickstart failed

[flaky-bot[bot]]

Note: #12049 was also for this test, but it was closed more than 10 days ago. So, I didn't mark it flaky.

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commit: 3b1d83fa332aed85f9171e36af0f24055e3e4520 buildURL: Build Status, Sponge status: failed

[msampathkumar]

Sharing info from log files

• File "/workspace/iam/cloud-client/snippets/quickstart_test.py", line 54, in test_quickstart
• google.api_core.exceptions.InvalidArgument: 400 Service account

[msampathkumar]

Hi. I'm unmarking myself from this issues due knowledge gaps on Python IAM samples.