Add kube-api-linter in operator template.

Alex Ghitarequested to merge
ag/kube-api-linter into main

Add a new kube-api-linter as requested in #65 . Suggested in sylva-projects/sylva-elements/sylva-units-operator!601 (comment 3468510429)

To not affect repos that do not have kube-api-lint "$KUBE_API_LINT_OPERATOR_ENABLED" will be used to trigger job run.

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