use default units per instruction in fee calculation #26785

Active on mainnet-beta (epoch 478), testnet (epoch 465) and devnet (epoch 509).

Introduced in solana-labs/solana PR #26786.

Feature id 8sKQrMQoUHtQSUP83SPG4ta2JDjSAiWs7t5aJ9uEd6To.

Vortex

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