test flake in TestLeader_RollRaftServer

[tgross]

Example run: https://app.circleci.com/pipelines/github/hashicorp/nomad/28563/workflows/e087b535-aa13-470a-97d2-384c4cb9ae05/jobs/315033. This has failed frequently on main, but I've seen it a bunch on other branches as well. Note that when this fails it can take >1min to do so, which also slows down test runs. See the CircleCI link for logs, which are very long for this one.

This test exercises similar code paths to #13931

[github-actions]

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