Workflow 2.5.30

Skip payload decoding for history event types that cannot match an activity
or a parallel member failure during replay. Recorded retry policies, member
identity and failure order are preserved.

This patch adds read-count regressions and a replay corpus case. It introduces
no retained execution or cross-call cache.

Update the Workflow package to 2.5.30 and restart persistent workers to load
the new code.

See #831 for qualification.