allow merging active stakes with unmatched credits_observed #18985

Active on mainnet-beta (epoch 241), testnet (epoch 237) and devnet (epoch 198).

Introduced in solana-labs/solana PR #18985.

Feature id meRgp4ArRPhD3KtCY9c5yAf2med7mBLsjKTPeVUHqBL.

Vortex

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