Clean up splitters in catalog

[yoavkatz]

These splitters in unitxt/prepare/splitters/missing_split.py are do not have informative names, so when people read them in a file , it's not clear what's happening.

I think it's just better to explicitly use the operator in the card, it contains all the relevant information

add_to_catalog( SplitRandomMix( {"train": "train[95%]", "validation": "train[5%]", "test": "validation"} ), "splitters.small_no_test", overwrite=True, ) add_to_catalog( SplitRandomMix( {"train": "train[99%]", "validation": "train[1%]", "test": "validation"} ), "splitters.large_no_test", overwrite=True, ) # Note, this would be change in future version to a constant amount of examples (500) instead of 1% of the examples add_to_catalog( SplitRandomMix({"train": "train[99%]", "validation": "train[1%]", "test": "test"}), "splitters.large_no_dev", overwrite=True, ) # Note, this would be change in future version to a constant amount of examples (500) instead of 1% of the examples add_to_catalog( SplitRandomMix({"train": "train[95%]", "validation": "train[5%]", "test": "test"}), "splitters.small_no_dev", overwrite=True, ) add_to_catalog( SplitRandomMix({"train": "test[0%]", "validation": "test[0%]", "test": "test"}), "splitters.test_only", overwrite=True, )