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889b1c4475
**Motiviation** All networks have completed the merge transition and most execution clients no longer support pre-merge so it's not even possible anymore to run a network from a genesis before bellatrix, unless you keep it to phase0/altair only, which still works after this PR is merged. This code is effectively tech debt, no longer exercised and just gets in the way when doing refactors. **Description** Removes all code related to performing the merge transition. Running the node pre-merge (CL only mode) is still possible and syncing still works. Also removed a few CLI flags we added for the merge specifically, those shouldn't be used anymore. Spec constants like `TERMINAL_TOTAL_DIFFICULTY` are kept for spec compliance and ssz types (like `PowBlock`) as well. I had to disable a few spec tests related to handling the merge block since those code paths are removed. Closes https://github.com/ChainSafe/lodestar/issues/8661