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What type of PR is this?
Bug fix
What does this PR do? Why is it needed?
This PR fixes a bug in the PrepareBeaconProposer API which is duplicating validator indexes when not persisted in DB, it does not disrupt the feature for users and is only done at startup and dynamic changes to fee recipient. It however can double the size of the request as well as printing duplicates in log. A unit test was added to catch similar errors in the future.