fix(flaky): ignore false positive exception

Summary

• fix(flaky): ignore false positive exception

• Currently we use Retriable for handling flaky sql tests (temporary solution). If our sql query succeeded but on client the timeout was raised, Retriable will execute the query again. This may lead to situation, when we will get an error for violating unique index. This commit ignores this error

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• Close #786 (closed)
• Cherry-pick to: none
• Docs follow-up: not necessary

assigned to @senya_volynets

requested review from @d.rodionov

changed the description

Давай поправим мелочь и зальем

approved this merge request

added 39 commits

• fbddc40d...8c8e33cd - 38 commits from branch master
• 4626fa1b - fix(flaky): ignore false positive exception

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merged