Replace many minor usages of errors with errkit #7245

Job	Run time
docs	29s
gomod	1m 0s
image_tags	1s
reno_lint	40s
lint	3m 45s
test (test)	4m 27s
build (controller)	2m 26s
test (integration-test)	4m 18s
build (kanctl)	2m 23s
test (helm-test)	3m 16s
build (kando)	2m 14s
release	0s
release_example_docker_images	0s
	24m 59s

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