OZG-3328 cleanup and add helm unittests

...test/helm/deployment_defaults_containers_health_test.yaml

xta-adapter/run_helm_test.sh

xta-adapter/src/main/helm/templates/image_pull_secret.yaml

xta-adapter/src/test/helm/image_pull_secret_test.yaml

xta-adapter/src/test/helm/service_account_test.yaml

...adapter/src/test/helm/xta_adapter_cronjob_basic_test.yaml

...pter/src/test/helm/xta_adapter_cronjob_bindings_test.yaml

.../src/test/helm/xta_adapter_cronjob_dummy_probes_test.yaml

xta-adapter/src/test/helm/xta_adapter_cronjob_env_test.yaml

...ter/src/test/helm/xta_adapter_cronjob_resources_test.yaml

...apter/src/test/helm/xta_adapter_cronjob_volumes_test.yaml

xta-adapter/src/test/helm/xta_bindings_type_test.yaml

xta-adapter/src/test/helm/xta_keystore_secret_test.yaml

xta-adapter/src/test/helm/xta_root_ca_secret_test.yaml