Add failing test for abstract subclass build error #1571

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10 errors and 15 warnings

cannot construct `root::Bob` with struct literal syntax due to private fields

struct `root::Bob` has no field named `a`

struct `root::Bob` has no field named `do_not_attempt_to_allocate_nonpod_types`

unresolved import `ffi::Observer_supers`

no method named `foo_super` found for reference `&MyObserver` in the current scope

the trait bound `MyObserver: CppPeerConstructor<MyObserverCpp>` is not satisfied

Rust subclasses of C++ types must by public

cannot find type `MyObserver` in module `super::super::super`

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, Swatinem/rust-cache@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

unused return value of `Box::<T>::from_raw` that must be used

the item `Emplace` is imported redundantly

unused variable: `stack_obj`

unused import: `autocxx :: prelude :: *`

unused implementer of `New` that must be used

The `save-state` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/