Sort list in `test_get_available_shards` remove flakiness in split_test.py #10701

Job	Run time
Check whether we should run tests or not	11s
HuggingFace Python 3.10 tests	2m 17s
Github API tests	2m 5s
Notebook tests	6m 52s
Core TFDS tests / Generate shards	1s
Core TFDS tests / [Python 3.10][1/4]	5m 9s
Core TFDS tests / [Python 3.11][1/4]	4m 51s
Core TFDS tests / [Python 3.12][1/4]	5m 22s
Core TFDS tests / [Python 3.10][2/4]	4m 29s
Core TFDS tests / [Python 3.11][2/4]	4m 11s
Core TFDS tests / [Python 3.12][2/4]	5m 12s
Core TFDS tests / [Python 3.10][3/4]	4m 48s
Core TFDS tests / [Python 3.11][3/4]	4m 32s
Core TFDS tests / [Python 3.12][3/4]	5m 25s
Core TFDS tests / [Python 3.10][4/4]	5m 18s
Core TFDS tests / [Python 3.11][4/4]	4m 55s
Core TFDS tests / [Python 3.12][4/4]	5m 25s
	1h 11m 3s

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