merge NonceError into SystemError

Active on mainnet-beta (epoch 351), testnet (epoch 212) and devnet (epoch 163).

Introduced in null PR #null.

Feature id 21AWDosvp3pBamFW91KB35pNoaoZVTM7ess8nr2nt53B.

Vortex

• Consensus leaderboard
• Fees leaderboard
• Validators
• Stake pools
• Decentralization
• Client versions
• Cluster status
• Governance
• Feature gates
• SIMDs
• Activity
• API and AI usage