fix: keyholder check should use HistoricalActiveEpochs
#5325
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Pull Request
Closes: PRO-1721
Checklist
Please conduct a thorough self-review before opening the PR.
Summary
This is more reliable than using HistoricalAuthorities because the latter is not cleared when an epoch expires.
Preivously is was possible for a validator to be considered active for an expired epoch if the epochs were expired out-of-order (see updated test case).