Fix test test_workload_entity_keeper_storage: add more retries

[serxa]

Report that found the problem:
https://s3.amazonaws.com/clickhouse-test-reports/0/27b4e80983af9ead55425e56d2c4044003d28dcb/integration_tests__asan__old_analyzer__%5B6_6%5D.html

after ZK connection loss (which is in this test scenario), connection was resumed too late and test have failed. I checked the logs. Connection was resumed and all the expected data was obtained by node2, but it was too late. I increased timeout from 5 seconds to 70 with exp increase of retry periods.

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[robot-ch-test-poll2]

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Check name	Description	Status
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