testnet: plan state reset + introduction of new staging environment

[Eikix]

Kakarot Sepolia is coming!

Kakarot Sepolia appchain reset:

Tasks

Beta Give feedback

1. Sync with SW and give green light to reset Kakarot appchain (called Kakarot Sepolia)
2. Redeploy latest released Kakarot contracts to appchain + PR Kakarot repo with new deployments artifacts
3. Update Karnot indexer environment variable, faucet environment variable, RPC docker-compose files
4. Fund faucet private key
5. Reset block explorers

Kakarot Staging appchain creation:

Tasks

Beta Give feedback

1. Sync with SW and give green light to start Kakarot staging (integration environment)
2. Deploy latest released Kakarot contracts to appchain + PR Kakarot repo with new deployments artifacts
3. Update local docker-compose staging indexer environment variable, RPC docker-compose files
4. Create a staging blockscout service as block explorer