test: Example that returns grpc error code of 1

[danieljbruce]

This test prints the grpc error code so that we have a reference that shows which grpc code is returned.

[generated-files-bot[bot]]

Warning: This pull request is touching the following templated files:

• .kokoro/conformance.sh - .kokoro files are templated and should be updated in synthtool

[conventional-commit-lint-gcf[bot]]

🤖 I detect that the PR title and the commit message differ and there's only one commit. To use the PR title for the commit history, you can use Github's automerge feature with squashing, or use automerge label. Good luck human!

-- conventional-commit-lint bot https://conventionalcommits.org/