demote program write locks to readonly, except when upgradeable loader present #19593 #20265

Active on mainnet-beta (epoch 233), testnet (epoch 237) and devnet (epoch 198).

Introduced in solana-labs/solana PR #19593.

Feature id 3E3jV7v9VcdJL8iYZUMax9DiDno8j7EWUVbhm9RtShj2.

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