Simplify checks performed for writable upgradeable program accounts #30559

Active on mainnet-beta (epoch 558), testnet (epoch 582) and devnet (epoch 582).

Introduced in solana-labs/solana PR #30561.

Feature id 5ZCcFAzJ1zsFKe1KSZa9K92jhx7gkcKj97ci2DBo1vwj.

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