fix(bigquery): Fix bigquery socket leak - #17953

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fix/bigquery-socket-leak-whitebox

Commits on Jul 31, 2026

refactor(bigquery): use sets for tracking leaked sessions/channels per PR comments
chalmerlowe
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refactor(bigquery): use instance-level patching for Session.close() for symmetry and isolation
chalmerlowe
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fix(bigquery): close cursors before clients and add defensive None checks in Connection.close()
chalmerlowe
committed