chore: Tidy up dnspolicy controller code and files (#967) #4278

Job	Run time
Integration Tests for kuadrant-operator/tests/bare_k8s	5m 57s
Integration Tests for kuadrant-operator/controllers (istio, istioctl)	13m 23s
Integration Tests for kuadrant-operator/tests/[gatewayapi-provider] (istio)	7m 8s
Integration Tests for kuadrant-operator/controllers (envoygateway)	14m 4s
Integration Tests for kuadrant-operator/tests/[gatewayapi-provider] (envoygateway)	8m 36s
Integration Tests for kuadrant-operator/tests/gatewayapi	5m 40s
Unit Tests (1.22.x, ubuntu-latest)	2m 2s
Verify bundle	1m 2s
Verify manifests	42s
Test Scripts (1.22.x, ubuntu-latest)	11s
Test Scripts (1.22.x, macos-latest)	14s
Verify fmt	13s
Verify generate	32s
Verify go.mod	16s
Verify helm charts	1m 6s
	1h 1m 6s

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