[upgrade] Reconciler error on openshift-gitops-applicationset-controller

While upgrading the operator from v1.1.2 to v1.2, I noticed a Reconciler error on openshift-gitops-applicationset-controller. This does not allow the operator to reconcile any other resources/workloads ordered after applicationsets in the reconcile workflow. 

Example: SSO feature cannot be enabled due to the reconciler error.

Error log:
```

{"level":"error","ts":1626957487.1035492,"logger":"controller-runtime.controller","msg":"Reconciler error","controller":"argocd-controller","request":"openshift-gitops/openshift-gitops","error":"Deployment.apps \"openshift-gitops-applicationset-controller\" is invalid: [spec.template.spec.containers[0].volumeMounts[0].name: Not found: \"ssh-known-hosts\", spec.template.spec.containers[0].volumeMounts[1].name: Not found: \"tls-certs\", spec.template.spec.containers[0].volumeMounts[2].name: Not found: \"gpg-keys\", spec.template.spec.containers[0].volumeMounts[3].name: Not found: \"gpg-keyring\", spec.template.spec.containers[0].volumeMounts[4].name: Not found: \"argocd-repo-server-tls\"]","stacktrace":"github.com/go-logr/zapr.(*zapLogger).Error\n\t/go/src/github.com/redhat-developer/gitops-operator/vendor/github.com/go-logr/zapr/zapr.go:128\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler\n\t/go/src/github.com/redhat-developer/gitops-operator/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:258\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem\n\t/go/src/github.com/redhat-developer/gitops-operator/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:232\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).worker\n\t/go/src/github.com/redhat-developer/gitops-operator/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:211\nk8s.io/apimachinery/pkg/util/wait.BackoffUntil.func1\n\t/go/src/github.com/redhat-developer/gitops-operator/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:155\nk8s.io/apimachinery/pkg/util/wait.BackoffUntil\n\t/go/src/github.com/redhat-developer/gitops-operator/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:156\nk8s.io/apimachinery/pkg/util/wait.JitterUntil\n\t/go/src/github.com/redhat-developer/gitops-operator/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:133\nk8s.io/apimachinery/pkg/util/wait.Until\n\t/go/src/github.com/redhat-developer/gitops-operator/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:90"}

```

Steps to reproduce:
Upgrade the operator to v1.2
Update the ArgoCD CR to make any changes like Enable HA, Enable SSO.

 

Acceptance Criteria:
No reconciler error should be seen on the operator during upgrade.