feat: job creation mode GA

[alvarowolfx]

Previously, use of the QUERY_PREVIEW_ENABLED environmental variable to control whether this client would attempt to execute queries without creating jobs. Now that this feature is GA, this client has been updated to expose a new client creation option defaultJobCreationMode to control this behavior. Also this can be overridden per query by the Query config attribute jobCreationMode.

This library will no longer use QUERY_PREVIEW_ENABLED to control this behavior, and the environment variable is ignored.

Towards internal b/418823080 🦕

[snippet-bot]

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• samples/queryShortMode.js:18, tag bigquery_query_shortmode(usage: page 1).

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• samples/queryJobOptional.js:18, tag bigquery_query_job_optional

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• samples/queryShortMode.js:18, tag bigquery_query_shortmode

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