add disable instance component (#319)

openshift-gitops-operator/operator/components/disable-default-instance/README.md

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+# disable-default-instance
+
+## Purpose
+This component disables the creation of a default ArgoCD instance in the `openshift-gitops` namespace.
+
+For more information on this option please refer to the following:
+
+[5 global environment variables provided by OpenShift GitOps](https://developers.redhat.com/articles/2023/03/06/5-global-environment-variables-provided-openshift-gitops)
+
+## Usage
+
+This component can be added to a base by adding the `components` section to your overlay `kustomization.yaml` file:
+
+```
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - ../../base
+
+components:
+  - ../../components/disable-default-instance
+```

openshift-gitops-operator/operator/components/disable-default-instance/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1alpha1
+kind: Component
+
+patches:
+  - path: patch-subscription.yaml
+    target:
+      kind: Subscription

openshift-gitops-operator/operator/components/disable-default-instance/patch-subscription.yaml

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+apiVersion: operators.coreos.com/v1alpha1
+kind: Subscription
+metadata:
+  name: openshift-gitops-operator
+spec:
+  config:
+    env:
+      - name: DISABLE_DEFAULT_ARGOCD_INSTANCE
+        value: true