[DO NOT MERGE] [BEAM-7463] fix flaky bigquery io ITs

[Juta]

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Post-Commit Tests Status (on master branch)

Lang	SDK	Apex	Dataflow	Flink	Gearpump	Samza	Spark
Go		---	---		---	---
Java
Python		---			---	---

Pre-Commit Tests Status (on master branch)

---	Java	Python	Go	Website
Non-portable
Portable	---		---	---

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[Juta]

Run Python PostCommit

[Juta]

Run Python PostCommit