Disable account loader special case

Active on mainnet-beta (epoch 728), testnet (epoch 713) and devnet (epoch 800).

Minimum versions: Agave v2.1.1 / v2.0.15.

Introduced in anza-xyz/agave PR #3548.

Feature id EQUMpNFr7Nacb1sva56xn1aLfBxppEoSBH8RRVdkcD1x.

Vortex

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