Python ExternalTransformProvider improvements (#33359) #30868

Job	Run time
Build python source distribution	1m 50s
Check environment variables	16s
Prepare GCS	7s
Build python cp39- wheels on auto for ubuntu-20.04	59s
Build python cp310- wheels on auto for ubuntu-20.04	58s
Build python cp311- wheels on auto for ubuntu-20.04	52s
Build python cp312- wheels on auto for ubuntu-20.04	56s
Build python cp39- wheels on auto for macos-13	56s
Build python cp310- wheels on auto for macos-13	54s
Build python cp311- wheels on auto for macos-13	54s
Build python cp312- wheels on auto for macos-13	55s
Build python cp39- wheels on auto for windows-latest	46s
Build python cp310- wheels on auto for windows-latest	45s
Build python cp311- wheels on auto for windows-latest	48s
Build python cp312- wheels on auto for windows-latest	46s
Build python cp39- wheels on aarch64 for ubuntu-20.04	32s
Build python cp310- wheels on aarch64 for ubuntu-20.04	44s
Build python cp311- wheels on aarch64 for ubuntu-20.04	1s
Build python cp312- wheels on aarch64 for ubuntu-20.04	58s
Upload python source distribution to GCS bucket	10s
Upload wheels to GCS bucket	1s
Branch repo nightly	1s
List files on Google Cloud Storage Bucket	1s
	15m 10s

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