[Python] Remove obsolete callback handling

The Call() function currently still has some callback handling code
the completeEvent and callbackRes variables. These are only used when
callbacks are in play, like pychip_DeviceController_Commission or
pychip_DeviceController_OpenCommissioningWindow. When calling these
functions CallAsyncWithCompleteCallback() needs to be used (and is
beeing used in all cases).

In practice, on single threaded applications this is not a problem.
However, when calling the SDK from multiple threads, then another Call()
Might accidentally release a call to CallAsyncWithCompleteCallback()
early.

src/controller/python/chip/ChipStack.py

@@ -194,9 +194,6 @@ def __call__(self):
         pythonapi.Py_DecRef(py_object(self))
 
 
-_CompleteFunct = CFUNCTYPE(None, c_void_p, c_void_p)
-_ErrorFunct = CFUNCTYPE(None, c_void_p, c_void_p,
-                        c_ulong, POINTER(DeviceStatusStruct))
 _LogMessageFunct = CFUNCTYPE(
     None, c_int64, c_int64, c_char_p, c_uint8, c_char_p)
 _ChipThreadTaskRunnerFunct = CFUNCTYPE(None, py_object)
@@ -272,21 +269,11 @@ def __init__(self, persistentStoragePath: str, installDefaultLogHandler=True,
             self.logger.addHandler(logHandler)
             self.logger.setLevel(logging.DEBUG)
 
-        def HandleComplete(appState, reqState):
-            self.callbackRes = True
-            self.completeEvent.set()
-
-        def HandleError(appState, reqState, err, devStatusPtr):
-            self.callbackRes = self.ErrorToException(err, devStatusPtr)
-            self.completeEvent.set()
-
         @_ChipThreadTaskRunnerFunct
         def HandleChipThreadRun(callback):
             callback()
 
         self.cbHandleChipThreadRun = HandleChipThreadRun
-        self.cbHandleComplete = _CompleteFunct(HandleComplete)
-        self.cbHandleError = _ErrorFunct(HandleError)
         # set by other modules(BLE) that require service by thread while thread blocks.
         self.blockingCB = None
 
@@ -389,15 +376,9 @@ def Call(self, callFunct, timeoutMs: int = None):
         This function is a wrapper of PostTaskOnChipThread, which includes some handling of application specific logics.
         Calling this function on CHIP on CHIP mainloop thread will cause deadlock.
         '''
-        # throw error if op in progress
-        self.callbackRes = None
-        self.completeEvent.clear()
         # TODO: Lock probably no longer necessary, see https://github.com/project-chip/connectedhomeip/issues/33321.
         with self.networkLock:
             res = self.PostTaskOnChipThread(callFunct).Wait(timeoutMs)
-        self.completeEvent.set()
-        if res == 0 and self.callbackRes is not None:
-            return self.callbackRes
         return res
 
     async def CallAsync(self, callFunct, timeoutMs: int = None):