do not merge: Electra sync forced with Sepolia

[LeanSerra]

Motivation

Sync Sepolia

Description

• Comment out the blob validations
• When we get a block with missing blobs we schedule the download but process the block anyways
• We were constantly penalizing peers so that was also commented out

Findings

• The peers are constantly being penalized resulting in running out of peers
• After checkpoint-sync when downloading blocks the chain wouldn't advance because the next block was stuck in :download_blobs
• After commenting the blob validation I run into an issue only once in several tries:
  • The chain was advancing but one block failed because it was from "the future" which resulted in that block having the status of :invalid when it wasn't the check for ForkChoice.future_slot? in process_block tries to fix this but its not really tested

[rodrigo-o]

This will be closed until we start delving in Sepolia syncing again.