[3.12] gh-109746: Make _thread.start_new_thread delete state of new thread on its startup failure (GH-109761) (GH-127173)

If Python fails to start newly created thread
due to failure of underlying PyThread_start_new_thread() call,
its state should be removed from interpreter' thread states list
to avoid its double cleanup.

(cherry picked from commit ca3ea9ad05)

Co-authored-by: Radislav Chugunov <52372310+chgnrdv@users.noreply.github.com>

Modules/_threadmodule.c

@@ -1219,6 +1219,7 @@ thread_PyThread_start_new_thread(PyObject *self, PyObject *fargs)
     if (ident == PYTHREAD_INVALID_THREAD_ID) {
         PyErr_SetString(ThreadError, "can't start new thread");
         PyThreadState_Clear(boot->tstate);
+        PyThreadState_Delete(boot->tstate);
         thread_bootstate_free(boot, 1);
         return NULL;
     }