Add tests to ensure BQIO Export (Python SDK) Works as intended. #26358
Description
What happened?
#26270 introduced a regression that was caught manually- that is, when using ReadFromBigQuery IO (Python SDK) Export mode, files are exported to GCS, read from GCS, then deleted from GCS.
We should ensure that the files are actually deleted from GCS.
Issue Priority
Priority: 3 (minor)
Issue Components
- Component: Python SDK
- Component: Java SDK
- Component: Go SDK
- Component: Typescript SDK
- Component: IO connector
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