fix: process timely flags for forks >= Altair #15994
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Problem: processIncludedAttestation() gated timely-flag handling by state.Version() == version.Altair, which disables processing on all forks after Altair (Bellatrix, Capella, Deneb, Electra, Fulu). This causes missing timely flag updates and metrics beyond Altair despite participation bits and flag indices existing in later forks.
Fix: Change the gate to state.Version() >= version.Altair so the logic runs on all post-Altair versions.
Tests: Added TestProcessIncludedAttestation_Bellatrix to ensure timely flags are processed in Bellatrix using a deterministic Bellatrix genesis and participation bits; asserts the same “Attestation included” logs and timely flags as the Altair test.