fix: chunk EtherFi withdrawal requests at 1,000 eETH

[naddison36]

Summary

• Split Ether.fi withdrawals into sequential requests capped at 1,000 eETH
• Convert the 1,000 eETH limit into weETH shares using the configured WETH ARM adapter
• Prevent the automated eETH and weETH withdrawal actions from reverting when balances exceed Ether.fi’s per-request limit
• Add coverage for exact-limit, remainder, exact-multiple, and weETH-converted chunking

Testing

• node test/js/etherfiQueue.test.js
• Prettier
• git diff --check