feat: add support for polling in FlexConnect server #675

Job	Run time
Collect changes / collect-changes	6s
Python tests / lint-and-format-check	38s
Python tests / types-check	1m 4s
Python tests / unit-tests (py313)	3m 10s
Python tests / unit-tests (py312)	6m 46s
Python tests / unit-tests (py311)	2m 36s
Python tests / unit-tests (py310)	2m 35s
Python tests / unit-tests (py39)	2m 57s
status-check	1s
	19m 53s

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