fix: set eth upgrades in backwards compatible way #667
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Why this should be merged
Current code does not function for mainnet/fuji.
When running a node with those chain IDs, the existing chain config will not have berlin/london & shanghai.
Therefore, we should apply the SetEthUpgrade anytime we unmarshal the config, including in the genesis,
prior to checking for compatibility.
How this works
As explained.
How this was tested
[x] Added UT
[x] Tested by using database from running node, then continuing with this version (fuji)