add sensitive_params to bigquery_data_transfer_config

[modular-magician]

Fixes #7125

I tested this locally, but not sure I can add a test in since it would require AWS credentials.

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Release Note Template for Downstream PRs (will be copied)

bigquerydatatransfer: fixed `params.secret_access_key` perma-diff for AWS S3 data transfer config types by adding a `sensitive_params` block with the `secret_access_key` attribute.

Derived from GoogleCloudPlatform/magic-modules#3937

[ghost]

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