Add CI job to validate deployedContracts.json and contract verification

[coderabbitai]

As per PR #112 and this comment, @adu-web3 requested to add a CI job to:

1. Check that deployedContracts.json exists
2. Ensure necessary fields exist
3. Verify that deployed contracts are verified on Etherscan (otherwise we cannot retrieve their storage layout)

[adu-web3]

another approach is that: we could compare the storage layout against the base(main) branch instead of against the deployed contracts, which might be easier to maintain