The ABI check has false positives

[pablogsal]

The check-abidump target reports ABI changes for types defined in Include/internal/pycore_*.h headers, even though these are explicitly not part of CPython's public ABI. For example, adding a field to _ceval_runtime_state or modifying `_PyRuntimeState`` triggers ABI violation warnings.

This happens because internal types are transitively reachable through public API functions like PyInterpreterState_Clear(), causing libabigail to report changes even with --drop-private-types.

Linked PRs

• gh-143253: Add libabigail suppression file for internal types #143254