Fix flaky test MultiDbConnectionProviderFailoverAttemptsConfigTest.delayBetweenFailoverAttempts_permanentExceptionAfterAttemptsExhausted

[ggivo]

Error: Failures:
Error: MultiDbConnectionProviderFailoverAttemptsConfigTest.delayBetweenFailoverAttempts_permanentExceptionAfterAttemptsExhausted:108 expected: <1> but was: <2>

[Ra9huvansh]

Hi @ggivo, I'd like to fix this. I plan to increase the delay window and await timeout to make the timing-sensitive assertion deterministic in CI.