Backport of ci: fix TestNomad_BootstrapExpect_NonVoter test into release/1.3.x

[hc-github-team-nomad-core]

Backport

This PR is auto-generated from #14407 to be assessed for backporting due to the inclusion of the label backport/1.3.x.

The below text is copied from the body of the original PR.

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PR #12130 refactored the test to use the wantPeers helper, but this
function only returns the number of voting peers, which in this test
should be equal to 2.

I think the tests were passing back them because of a bug in Raft
(hashicorp/raft#483) where a non-voting server
was able to transition to candidate state.

One possible evidence of this is that a successful test run would have
the following log line:

raft@v1.3.5/raft.go:1058: nomad.raft: updating configuration: command=AddVoter server-id=127.0.0.1:9101 server-addr=127.0.0.1:9101 servers="[{Suffrage:Voter ID:127.0.0.1:9107 Address:127.0.0.1:9107} {Suffrage:Voter ID:127.0.0.1:9105 Address:127.0.0.1:9105} {Suffrage:Voter ID:127.0.0.1:9103 Address:127.0.0.1:9103} {Suffrage:Voter ID:127.0.0.1:9101 Address:127.0.0.1:9101}]"

This commit reverts the test logic to check for peer count, regardless
of voting status.

I ran it a few times in CI and there were no failures in this test anymore.

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