Database Migration (cost reduction) - P6 still in effect

[mh-concordium]

While P6 is still in effect: Catch up from scratch with Node6 to P3, then upgrade to Node7, let it catch up until the end. After it has caught up:

• Deploy contract, send transaction to the node 7
• Invoke contracts on node 7

Such a test should be conducted on both

• [ ] Stagenet
• [ ] Testnet