[3.12] gh-109853: Fix sys.path[0] For Subinterpreters (gh-109994)#110701
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This change makes sure sys.path[0] is set properly for subinterpreters. Before, it wasn't getting set at all.
This change does not address the broader concerns from gh-109853.
Note that here, unlike in main, we do not add
PyConfig.sys_path_0, since that changes the ABI. Instead, we add_PyRuntimeState.sys_path_0.(cherry-picked from commit a040a32)