Return a result object instead of void when publishing execution payload

[StefanBratanov]

PR Description

Return PublishSignedExecutionPayloadResult instead of Void. Also only imports execution payload if gossip validation passes (which should have been the logic from the start and it is per current PR specs ethereum/beacon-APIs#552)

Also small changes to clean ForkChoice slightly

Fixed Issue(s)

N/A

Documentation

• I thought about documentation and added the doc-change-required label to this PR if updates are required.

Changelog

• I thought about adding a changelog entry, and added one if I deemed necessary.

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Note

Return a structured result when publishing execution payloads and only publish after successful gossip validation/import, with supporting store and fork-choice updates.

• API/Interfaces:
  • Change publishSignedExecutionPayload (in ValidatorApiChannel, BuilderApiChannel, sentry/failover/metrics adapters) to return PublishSignedExecutionPayloadResult instead of Void.
  • Add validator/api/PublishSignedExecutionPayloadResult.
  • Update ExecutionPayloadPublisher to return the same result; adjust NOOP.
• Publishing behavior (Gloas):
  • In ExecutionPayloadPublisherGloas, call ExecutionPayloadManager.validateAndImportExecutionPayload and publish payload/sidecars only on ACCEPT; otherwise return rejected with reason.
  • ValidatorApiHandler maps exceptions to rejected results.
• Spec/State/Fork-choice:
  • Expose SignedExecutionPayloadEnvelope.getBeaconBlockRoot() and use it in logs.
  • Add MutableStore.putExecutionPayloadAndState; implement in test store; stub in StoreTransaction.
  • ForkChoiceUtil/ForkChoiceUtilGloas: add availability checker overload for execution payloads and store execution payloads; use NOOP_DATACOLUMN_SIDECAR for Gloas.
  • DefaultExecutionPayloadManager: remove separate import method; validate then import async; cache seen roots; improved logging.
• Misc:
  • ChainBuilder and other callers switch to getBeaconBlockRoot().
• Tests:
  • Update/extend unit tests across validator, publisher, fork-choice, execution manager, debug dumper to assert new return type and behavior.

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