feat: walk out dir

[colinnielsen]

Background

Checklist

• Documentation updated
• Tested code changes

ticket

[linear]

MP-322 Allow failures in ABI sourcing

Error: ENOENT: no such file or directory, scandir 'out/MapleLoan.sol'
    at readdirSync (node:fs:1527:3)
    at /Users/chun/.config/yarn/global/node_modules/0xmetropolis/cli/dist/utils/index.js:107:49
    at Array.reduce (<anonymous>)
    at loadSolidityABIs (/Users/chun/.config/yarn/global/node_modules/0xmetropolis/cli/dist/utils/index.js:103:39)
    at getContractMetadata (/Users/chun/.config/yarn/global/node_modules/0xmetropolis/cli/dist/utils/foundry.js:169:42)
    at /Users/chun/.config/yarn/global/node_modules/0xmetropolis/cli/dist/commands/preview.js:153:64
    at Generator.next (<anonymous>)
    at fulfilled (/Users/chun/.config/yarn/global/node_modules/0xmetropolis/cli/dist/commands/preview.js:5:58)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5) {
  errno: -2,
  syscall: 'scandir',
  code: 'ENOENT',
  path: 'out/MapleLoan.sol'
}

from running metro preview --broadcast --chain-id 1 --optimize --optimizer-runs 0 scripts/DeployContracts.s.sol