chore: Errkit migration 5 (pkg/function) #7065

Job	Run time
gomod	52s
image_tags	1s
docs	29s
build (controller)	2m 20s
build (kanctl)	2m 23s
reno_lint	40s
build (kando)	2m 13s
lint	3m 34s
test (test)	11m 0s
test (integration-test)	7m 55s
test (helm-test)	3m 1s
release	0s
release_example_docker_images	0s
	34m 28s

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