[DO-NOT-MERGE][TEST] Investigate StateStoreSuite flakiness

[tdas]

No description provided.

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[tdas]

@zsxwing Can you take a look.
I havent quite nailed down why this was flaky, but my best guess is that its something to do with StreamingAggregationSuite leaving StateStore background thread running. Now this can happen in any test suite and it should not matter. So for to prevent this suite from failing i am making sure StoreStore is stopped before running this suite. Does this sound good.

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Test build #56402 has finished for PR 12160 at commit a361ea7.

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Test build #56441 has finished for PR 12160 at commit 1d2fb46.

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