Improve setup-scripts for tests

[Keyrxng]

Resolves #229

• added rpc-handler to pull a list of good RPCs to setup anvil with
• added a dedicated script for funding with retries
• improved the anvil setup script with retries

QA:

• https://github.com/ubq-testing/pay.ubq.fi/actions/runs/9278460006/job/25529499603

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