Revert "Deepcopy combine_fn in PrecombineFn and PostCombineFn." #29673

Job	Run time
Build python source distribution	45s
Check environment variables	17s
Build python wheels on for ubuntu-20.04	24m 25s
Prepare GCS	0s
Build python wheels on for ubuntu-20.04	20m 49s
Build python wheels on for ubuntu-20.04	20m 21s
Build python wheels on for ubuntu-20.04	24m 1s
Build python wheels on for ubuntu-20.04	19m 35s
Build python wheels on for macos-13	20s
Build python wheels on for macos-13	26s
Build python wheels on for macos-13	28s
Build python wheels on for macos-13	22s
Build python wheels on for macos-13	4m 29s
Build python wheels on for windows-latest	20s
Build python wheels on for windows-latest	29s
Build python wheels on for windows-latest	27s
Build python wheels on for windows-latest	22s
Build python wheels on for windows-latest	5m 21s
Upload python source distribution to GCS bucket	0s
Build python wheels on for ubuntu-20.04	35s
Build python wheels on for ubuntu-20.04	41s
Build python wheels on for ubuntu-20.04	41s
Build python wheels on for ubuntu-20.04	34s
Build python wheels on for ubuntu-20.04	1h 11m 20s
Branch repo nightly	0s
Upload wheels to GCS bucket	0s
List files on Google Cloud Storage Bucket	0s
	3h 17m 8s

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