prohibit simultaneous heartbeat reconfig and candidacy role state

It is possible that immediately before heartbeatReconfigFinish, we could transition to role Candidate. We cannot finish a reconfig while in role state Candidate. To fix this, we shall immediately call processLoseElection() if we detect that we have transitioned to role Candidate while the config state is kConfigHBReconfiguring, which will clear the Candidate role state.

Original description:
tags.js failing.
Very intermittent. Mostly seen on linux 32, but also once on linux 64 dur off.

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