kong-app release v5.2.0

From upstream chart version v2.51.0 onwards, the chart uses kong kubernetes ingress controller (kic) v3.5.0. This version of kic dropped the CRDs from its repository to use indepenently maintainted and versioned CRDs from the https://github.com/kong/kubernetes-configuration repository. For chart users that change the default kic version (ingressController.image), we advise to also change the CRDs installation values to match the kic version. Change kubectlApplyJob.files to any other file in helm/kong-app/files/ folder. The default for kic v3.5.0 is files/kong-kubernetes-configuration-v1.5.2.yaml.

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