Add C API tests for PySys_GetObject() and PySys_SetObject() #107735
Description
PySys_GetObject() will be changed in #106672, so we need tests.
Linked PRs
- gh-107735: Add C API tests for PySys_GetObject() and PySys_SetObject() #107736
- [3.12] gh-107735: Add C API tests for PySys_GetObject() and PySys_SetObject() (GH-107736) #107740
- [3.11] gh-107735: Add C API tests for PySys_GetObject() and PySys_SetObject() (GH-107736) #107741
- gh-107735: Move just added C API tests to better place #107743