dedupe config program signers

Active on mainnet-beta (epoch 256), testnet (epoch 212) and devnet (epoch 163).

Introduced in null PR #null.

Feature id 8kEuAshXLsgkUEdcFVLqrjCGGHVWFW99ZZpxvAzzMtBp.

Vortex

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