Add TF MNIST classification cost benchmark (#33391) #30861

Job	Run time
Check environment variables	11s
Build python source distribution	59s
Prepare GCS	8s
Build python cp39- wheels on auto for ubuntu-20.04	14m 28s
Build python cp310- wheels on auto for ubuntu-20.04	28m 26s
Build python cp311- wheels on auto for ubuntu-20.04	15m 38s
Build python cp312- wheels on auto for ubuntu-20.04	14m 9s
Build python cp39- wheels on auto for macos-13	3m 56s
Build python cp310- wheels on auto for macos-13	3m 59s
Build python cp311- wheels on auto for macos-13	2m 44s
Build python cp312- wheels on auto for macos-13	5m 21s
Build python cp39- wheels on auto for windows-latest	4m 28s
Build python cp310- wheels on auto for windows-latest	5m 10s
Build python cp311- wheels on auto for windows-latest	5m 12s
Build python cp312- wheels on auto for windows-latest	5m 1s
Build python cp39- wheels on aarch64 for ubuntu-20.04	1h 11m 9s
Build python cp310- wheels on aarch64 for ubuntu-20.04	1h 11m 9s
Build python cp311- wheels on aarch64 for ubuntu-20.04	1h 9m 1s
Build python cp312- wheels on aarch64 for ubuntu-20.04	50m 8s
Upload python source distribution to GCS bucket	9s
Branch repo nightly	1s
Upload wheels to GCS bucket	1s
List files on Google Cloud Storage Bucket	1s
	6h 11m 29s

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