fix(test): unbreak the perry-codegen lib-test build on main (-D warnings --all-targets)

[proggeramlug]

main at 60922041cd does not compile perry-codegen's lib-test target: two ImportedClass fixtures are missing #10484's constructor_has_synthetic_arguments field, so the required warnings gate (RUSTFLAGS="-D warnings" cargo check --workspace --all-targets) is red for every PR in the repo.

Both fixtures now set it to false, the behaviour they were written against.

How it got in: it landed with merge train 218 (#10652). That train's lint reported the warnings step failing, I diagnosed it as two unnecessary unsafe blocks in #10612's test code, fixed those, and confirmed the fix with cargo check -p perry-runtime --lib --tests — one crate. There were two independent failures behind that single gate, and verifying one was treated as clearing both. cargo check --lib cannot see cfg(test) code at all, so only the workspace --all-targets step catches this class.

Verified: RUSTFLAGS="-D warnings" cargo check --workspace --all-targets (usual cross-host UI exclusions) finishes clean, and cargo fmt --all --check passes.

[coderabbitai]

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📒 Files selected for processing (3)

• changelog.d/10682-codegen-testbuild-missing-field.md
• crates/perry-codegen/src/expr/instanceof_imported_rhs_tests.rs
• crates/perry-codegen/src/lower_call/new_builtin_shadow_tests.rs

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