Replace many minor usages of errors with errkit #7247

Job	Run time
docs	32s
gomod	59s
image_tags	1s
lint	3m 37s
test (test)	11m 23s
build (controller)	2m 30s
test (integration-test)	8m 22s
reno_lint	37s
build (kanctl)	2m 24s
test (helm-test)	3m 19s
build (kando)	2m 18s
release	0s
release_example_docker_images	0s
	36m 2s

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