chore(sdk): write local execution logs to stdout #localexecution

[connor-mccarthy]

Description of your changes:
In a notebook, stderr prints above stdout. For the logs to present sequentially and interleave correctly in a notebook, they must both write to the same place. We choose to write to stdout, consistent with print.

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[google-oss-prow]

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If you want CI signal for your change, please convert it to an actual PR.
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[connor-mccarthy]

/test all

[connor-mccarthy]

/assign @chensun

[chensun]

/lgtm

[google-oss-prow]

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