fix: fullnode schema validation + nodejs 22 + incorrect fullnode

[andreabadesso]

Motivation

• Some networks have 0 as the min_tx_weight, we must support them.
• Also, nodejs was set to v18 which is incompatible with our big int handling mechanism
• Also, we had a bug where the wallet-service would not request its own fullnode for some apis

Acceptance Criteria

• We must allow 0 for tx_weight related fullnode response validation
• We must use nodejs v22 for the lambdas
• We must set the fullnode url in the config singleton

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged
• Make sure either the unit tests and/or the QA tests are capable of testing the new features
• Make sure you do not include new dependencies in the project unless strictly necessary and do not include dev-dependencies as production ones. More dependencies increase the possibility of one of them being hijacked and affecting us.