lang: Deduplicate zero accounts against init accounts

[acheroncrypto]

Problem

Same as #3409 with the difference being the init constraint combined with zero (rather than all zero):

#[derive(Accounts)]
pub struct TestInitAndZero<'info> {
    #[account(init, ...)]
    pub init: Account<'info, Data>,
    #[account(zero)]
    pub zero: Account<'info, Data>,
    #[account(mut)]
    pub payer: Signer<'info>,
    pub system_program: Program<'info, System>,
}

Summary of changes

Deduplicate accounts with the zero constraint against accounts with the init constraint. Note that this only applies to init accounts that are declared before zero accounts, as initialization fails on its own if the order is reversed.

Additionally, this change only concerns the zero constraint, as passing the same account for multiple inits fails without needing additional checks due to the account already being created after the initial init.

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