OZG-6826: Add License Header

src/main/helm/templates/network_policy.yaml

src/main/helm/templates/service_account.yaml

src/test/helm-linter-values.yaml

src/test/helm/deployment_bayernid_certificate_test.yaml

src/test/helm/deployment_service_account_test.yaml

src/test/helm/grpc_certificate_test.yaml

src/test/helm/network_policy_test.yaml

src/test/helm/service_account_test.yaml