Delete Eth Specific Hardfork logic

[dereksione]

Describe the feature

There are many positions in the codebase where a hardfork condition is checked for and depending on the result, a decision is made.

We need to retain these basic data structure shapes for future hardforks, but delete the Eth specific hardfork logic

Additional context

No response

Tasks

Beta Give feedback

1. Delete Eth hardfork values from the Hardfork enum
2. Replace the FromStr implementation for the Hardfork enum