fast path when SDIFF command has the same key as the first key (#10663)
When user uses the same input key for SDIFF as the first one, the result must be empty, so we don't need to process the elements to test.
This method is like the one done in zset‘s `zsetChooseDiffAlgorithm`
Co-authored-by:
Oran Agra <oran@redislabs.com>
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