[Python] Optimize BigQuery copy jobs in file loads using multi-source copy #41445

Job	Run time
Check environment variables	21s
Build python source distribution	1m 14s
Build python cp312- wheels on auto for ubuntu-24.04	8m 38s
Build python cp313- wheels on auto for ubuntu-24.04	9m 2s
Build python cp311- wheels on auto for ubuntu-24.04	6m 12s
Build python cp313- wheels on auto for macos-15	16s
Build python cp310- wheels on auto for ubuntu-24.04	5m 3s
Build python cp313- wheels on auto for windows-latest	24s
Build python cp314- wheels on auto for ubuntu-24.04	11m 2s
Build python cp314- wheels on auto for macos-15	4m 55s
Build python cp312- wheels on auto for macos-15	17s
Build python cp310- wheels on auto for windows-latest	20s
Build python cp311- wheels on auto for macos-15	27s
Build python cp312- wheels on auto for windows-latest	26s
Build python cp310- wheels on aarch64 for ubuntu-24.04	12s
Build python cp314- wheels on auto for windows-latest	28m 32s
Build python cp312- wheels on aarch64 for ubuntu-24.04	16s
Build python cp311- wheels on auto for windows-latest	20s
Build python cp311- wheels on aarch64 for ubuntu-24.04	12s
Build python cp310- wheels on auto for macos-15	20s
Build python cp314- wheels on aarch64 for ubuntu-24.04	1h 45m 38s
Build python cp313- wheels on aarch64 for ubuntu-24.04	19s
Prepare GCS	-1s
Upload python source distribution to GCS bucket	-1s
Branch repo nightly	0s
Upload wheels to GCS bucket	0s
List files on Google Cloud Storage Bucket	0s
	3h 4m 24s

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