Add on_cancel callback for operator prompt #6871

Job	Run time
modified-files	28s
teams	0s
lint / eslint	2m 37s
e2e / test-e2e	43m 42s
build / build	4m 3s
build / changes	26s
test / test-app	2m 57s
test / test-python (ubuntu-latest-m, 3.9)	10m 47s
test / test-python (ubuntu-latest-m, 3.10)	9m 42s
test / test-python (ubuntu-latest-m, 3.11)	12m 45s
all-tests	1s
	1h 27m 28s

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