added acceptance test cases to full network e2e test

these include:
* PoP transactions get published to Bitcoin, and each contains an OP_RETURN starting with 'HEMI"
* PoP transactions are using the correct fee (approx 1 sat/vB)
* PoP miner only creates one BTC transaction for each keystone
* PoP payouts are calculated for each keystone starting at 25, and payout address matches PoP miner ETH address
* Bitcoin Finality for blocks starts at -9 and progresses in step with new Bitcoin blocks
* Bitcoin Finality returns same result for last 10 blocks and querying for specific block in that list