Fix clique-validators.sh script

[dapplion]

Changes:

Script from guide at https://docs.nethermind.io/nethermind/ethereum-client/private-networks/how-to-setup-a-nethermind-only-clique-based-chain#manual-setup does not work

• goerli.json has a trailing comma that breaks jq
• re-running the script errors in linux because directories exist
• TODO: Nodes can't connect to each other

Types of changes

What types of changes does your code introduce? Put an x in the boxes that apply

• [x] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation Update
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] Other (please describe):

Testing

Requires testing

• [x] Yes
• [ ] No

In case you checked yes, did you write tests??

• [ ] Yes
• [x] No

Comments about testing , should you have some (optional)

Must be tested manually, just run the script takes 30 seconds

./clique-validators.sh