Backport of test: ensure leader is still valid in reelection test into release/1.4.x #15268
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Backport
This PR is auto-generated from #15267 to be assessed for backporting due to the inclusion of the label backport/1.4.x.
The below text is copied from the body of the original PR.
The
TestLeader_Reelection
test waits for a leader to be elected and then makes some other assertions. But it implcitly assumes that there's no failure of leadership before shutting down the leader, which can lead to a panic in the tests. Assert there's still a leader before the shutdown.