feat: add support for polling in FlexConnect server #673

Job	Run time
Collect changes / collect-changes	6s
Python tests / lint-and-format-check	38s
Python tests / types-check	1m 10s
Python tests / unit-tests (py313)	2m 45s
Python tests / unit-tests (py312)	2m 45s
Python tests / unit-tests (py311)	2m 37s
Python tests / unit-tests (py310)	2m 29s
Python tests / unit-tests (py39)	2m 44s
status-check	1s
	15m 15s

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