feat(testutil/validatormock): port Charon validatormock to Rust#418

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bohdan/validatormock-foundation

Commits on May 22, 2026

feat(testutil/validatormock): port Phase 1 foundation

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feat(testutil/validatormock): port attest.go (SlotAttester)

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feat(testutil/validatormock): port propose.go (block proposal + builder reg)

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feat(testutil/validatormock): port synccomm.go (SyncCommMember)

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feat(testutil/validatormock): port component.go (Component scheduler)

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fix(testutil/validatormock/synccomm): replace OnceCell with CloseOnce signal
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fix(testutil/validatormock/component): drain in-flight duty tasks on shutdown
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fix(testutil/validatormock/component): surface error for DutyBuilderRegistration
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