[AutoOnboarding] Result dialog issue

[spdkimo]

After a repeat test ends, appearing result dialog shows 'Save and quit' and 'Quit', 'Save and quit' button doesn't save and doesn't quit

1. Go to 'Auto onboarding'
2. Select a device
3. Repeat 10 times
4. Wait

If another repeat test starts again, result dialog issue show up during test with wrong value

5. Close result dialog
6. Repeat 10 times again

[spdkimo]

Below logs are printing when try to repeat the test

Traceback (most recent call last):
File "/home/matter/spdkimo/ioter/src/common/common_window.py", line 472, in checkPosition
self.timer.stop()
AttributeError: 'NoneType' object has no attribute 'stop'