Fix infinite loop in test_str_to_map_expr_random_delimiters #10016
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Fixes #10012. test_str_to_map_expr_random_delimiters could infinitely loop if the data generator emitted two identical scalars. Updated the test to use a custom data generator that only emits unique values. Manually verified that the custom generator is retrying the underlying data generator for the specific DATAGEN_SEED value that originally triggered the infinite loop.