[jrmccluskey]

Deprecates usage of the apitools-generated BigQuery client, allows for use of the old types via shims.

Part of #37261

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[jrmccluskey]

I'll be honest I don't know how a review for a big agentic migration like this should work.

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Reminder, please take a look at this pr: @shunping

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Reminder, please take a look at this pr: @claudevdm

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[damccorm]

stop reviewer notifications

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