lang: Fix cpi feature instructions not accounting for discriminator overrides#3376
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Problem
CPI instruction discriminators do not take into account the potential discriminator overrides from the
#[interface]attribute (#2728) or the new custom discriminator support via#[instruction(discriminator = <VALUE>)](#3137):https://github.com/coral-xyz/anchor/blob/8ec7ec802a1a7d678b35501cccc7ea80fe24cc86/lang/syn/src/codegen/program/cpi.rs#L20
Summary of changes
cpifeature instructions not accounting for discriminator overrides