📝 Fix BigQuery Destination: fail when using Google Default Application Credentials

[shikanime]

What

Fixes: #32477

How

Determine whether to explicitly verify the service account format as a JSON string or rely on the Google Auth library to handle the validation.

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Name	Status	Preview	Comments	Updated (UTC)
airbyte-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 9, 2024 9:45pm

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[evantahler]

Closing in favor of #34073