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The 1inch token list is used to decrease the number of network requests when fetching token information from the node.
The related API has been broken since a long time, so there is no actual efficiency gain from using this list.
The updated version of their token API requires an API key, which is by far not worth it for this use case.
Pruning this code also removes the very annoying warning "unable to recover token list from 1inch" that is shown on every invocation of a Hardhat command, since the list is prefetched to make execution faster.
Test Plan
Code compiles.