chore(test): separate deterministic integration tests others

[fuyufjh]

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What's changed and what's your intention?

See background at #14707 (comment)

Did some experiments, but the failure rate seems to be random to me 😅

I'd like to separate the test into multiple parts: backfill_tests storage sink, so that we can know the failure in a finer granularity. Furthermore, it's easier to assign a true responsible person for any new failures.

Also renaming the test names to make it shorter.

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