fix: Do not set job timeout extra property if None

[bmwant]

Description

job_timeout_ms declared as optional (see docs), but setting it as None results in error:

google.api_core.exceptions.BadRequest: 400 POST https://bigquery.googleapis.com/bigquery/v2/projects/my-bq-project/jobs?prettyPrint=false: Invalid value at 'job.configuration.job_timeout_ms.value' (TYPE_INT64), "None"
Location: None
Job ID: 5f5bf5bd-dc77-7eda-a2d3-69420a6bf6d6
[{'@type': 'type.googleapis.com/google.rpc.BadRequest', 'fieldViolations': [{'field': 'job.configuration.job_timeout_ms.value', 'description': 'Invalid value at \'job.configuration.job_timeout_ms.value\' (TYPE_INT64), "None"'}]}]

because of allowing None, but not handling it properly. This fix doesn't cast None to a string in setter. Getter still works as expected, but we do not send invalid value in remote call.

Simple script to reproduce

fromtypingimportOptionalfromgoogle.cloudimportbigqueryquery="SELECT * FROM `project.table` LIMIT 1"client=bigquery.Client()
config=bigquery.QueryJobConfig(use_query_cache=True, allow_large_results=True)
my_timeout: Optional[int] =Noneconfig.job_timeout_ms=my_timeoutclient.query(query, job_config=config)

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[bmwant]

@Linchin updated, could you review?

[bmwant]

@Linchin rebased on the latest main branch

[Linchin]

Thank you for making the contribution and fix this bug for us! I wonder if you would like to lint the code, as this seems to be the only test that's failing. I haven't had the time to do it. To lint you need to install nox (pip install nox) and run nox -s lint in the repo.

[bmwant]

Fixed linting, you can re-run checks now

[Linchin]

LGTM