Inject SDK-side flattens while handling input/output coder mismatch in flattens. #32834

Job	Run time
Build python source distribution	50s
Check environment variables	10s
Build python cp39- wheels on auto for ubuntu-20.04	19m 2s
Prepare GCS	0s
Build python cp310- wheels on auto for ubuntu-20.04	18m 38s
Build python cp311- wheels on auto for ubuntu-20.04	18m 39s
Build python cp312- wheels on auto for ubuntu-20.04	18m 46s
Build python cp39- wheels on auto for macos-13	18s
Build python cp310- wheels on auto for macos-13	17s
Build python cp311- wheels on auto for macos-13	17s
Build python cp312- wheels on auto for macos-13	3m 47s
Build python cp39- wheels on auto for windows-latest	12s
Build python cp310- wheels on auto for windows-latest	30s
Build python cp311- wheels on auto for windows-latest	38s
Upload python source distribution to GCS bucket	0s
Build python cp312- wheels on auto for windows-latest	7m 0s
Build python cp39- wheels on aarch64 for ubuntu-20.04	7s
Build python cp310- wheels on aarch64 for ubuntu-20.04	11s
Build python cp311- wheels on aarch64 for ubuntu-20.04	13s
Build python cp312- wheels on aarch64 for ubuntu-20.04	1h 8m 38s
Branch repo nightly	0s
Upload wheels to GCS bucket	0s
List files on Google Cloud Storage Bucket	0s
	2h 38m 13s

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