BigQueryGetDataOperator should use project_id

[ying-w]

When calling BigQueryGetDataOperator without selected_fields the function will look up the schema using hook.get_schema(). Currently, this lookup doesn't use project_id, this PR fixes that and closes #30635

[boring-cyborg]

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[boring-cyborg]

Awesome work, congrats on your first merged pull request! You are invited to check our Issue Tracker for additional contributions.