Use sequential keys to make keys distribute better #10433

Job	Run time
Check whether we should run tests or not	12s
HuggingFace Python 3.10 tests	2m 13s
Notebook tests	6m 52s
Github API tests	2m 33s
Core TFDS tests / Generate shards	1s
Core TFDS tests / [Python 3.10][1/4]	5m 7s
Core TFDS tests / [Python 3.11][1/4]	5m 6s
Core TFDS tests / [Python 3.12][1/4]	6m 35s
Core TFDS tests / [Python 3.10][2/4]	4m 13s
Core TFDS tests / [Python 3.11][2/4]	4m 22s
Core TFDS tests / [Python 3.12][2/4]	5m 8s
Core TFDS tests / [Python 3.10][3/4]	4m 46s
Core TFDS tests / [Python 3.11][3/4]	5m 0s
Core TFDS tests / [Python 3.12][3/4]	5m 52s
Core TFDS tests / [Python 3.10][4/4]	5m 6s
Core TFDS tests / [Python 3.11][4/4]	5m 4s
Core TFDS tests / [Python 3.12][4/4]	5m 55s
	1h 14m 5s

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