Fix backup application path (redhat-appstudio#2723)

The original change introducing backup component was using clusterDir
which is not set. Instead of defining the clusterDir for each possible
cluster as it is done in other places:
```
- list:
    elements:
      - nameNormalized: stone-stg-m01
        values.clusterDir: stone-stg-m01
      - nameNormalized: stone-stg-rh01
        values.clusterDir: stone-stg-rh01
      - nameNormalized: stone-prd-m01
        values.clusterDir: stone-prd-m01
      - nameNormalized: stone-prd-rh01
        values.clusterDir: stone-prd-rh01
```
Simply use the normalized name of the cluster which correspond to the
folder structure within the backup component. This is a better solution
as we do not need to hardcode the cluster names in the backup component.

RHTAPSRE-215

Signed-off-by: Hugo Ares <hares@redhat.com>

argo-cd-apps/base/member/infra-deployments/backup/backup.yaml

@@ -12,7 +12,6 @@ spec:
               values:
                 sourceRoot: components/backup
                 environment: staging
-                clusterDir: ""
           - list:
               elements: []
   template:
@@ -21,7 +20,7 @@ spec:
     spec:
       project: default
       source:
-        path: '{{values.sourceRoot}}/{{values.environment}}/{{values.clusterDir}}'
+        path: '{{values.sourceRoot}}/{{values.environment}}/{{nameNormalized}}'
         repoURL: https://github.com/redhat-appstudio/infra-deployments.git
         targetRevision: main
       destination: