Add test for DCS failsafe mode, simulating k8s API being down

[dragomirp]

#677 enables DCS failsafe mode which should improve stability in overloaded environments where the k8s can become temporarily unavailable.

We should add integration tests for that scenario, stopping or otherwise disabling access to the k8s API and verify that the primary doesn't step down. We should also verify that the primary will step down if it cannot connect to all the replicas.

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/DPE-6070.

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