Fix snap Hardhat tasks

[naddison36]

Summary

Fixes the following Hardhat snapshot tasks:

• snapStakingStrat

  • Removes the unconditional @oplabs/talos-client dependency from the shared network helper.
  • Restores access to the Hardhat provider and network context.
  • Uses the existing IERC20Metadata ABI for IERC20 contract resolution.
  • Decodes beacon data using the fork returned by the beacon API.

• snapStaking

  • Removes the unnecessary signer lookup from this read-only task.

• snapVault

  • Normalizes the token symbol so lowercase values such as oeth resolve the correct deployment.

Test plan

pnpm hardhat snapStakingStrat --network mainnet --ssv false
pnpm hardhat snapStaking --network mainnet --index 2
pnpm hardhat snapVault --network mainnet --symbol oeth

[sparrowDom]

NIce, thank you for this