tarantool / tarantool / 15039615911

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test: fix flaky election pre-vote test

Before checking for the leader, we should wait for the cluster to regain a
full mesh topology (we modify the topology in some test cases), and we
should explicitly wait for the elections to finish.

Closes #7355

NO_CHANGELOG=<flaky test>
NO_DOC=<flaky test>

(cherry picked from commit 768bf1fad)

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