feat: add flatten option for sync plan

Signed-off-by: Ramiz Polic <[email protected]>

cmd/testdata/syncjob.yaml

@@ -63,19 +63,19 @@ sync:
 
  ## 6. Usage: Sync single key from multiple sources with templating
  - secretSources:
- - name: username # Username mapping, available as ".Data.username"
- secretRef:
- key: /source/credentials/username
+  - name: username # Username mapping, available as ".Data.username"
+  secretRef:
+  key: /source/credentials/username
 
- - name: password # Password mapping, available as ".Data.password"
- secretRef:
- key: /source/credentials/password
+  - name: password # Password mapping, available as ".Data.password"
+  secretRef:
+  key: /source/credentials/password
 
- - name: dynamic_query # Query mapping, available as "Data.dynamic_query.<key>"
- secretQuery:
- path: /source/credentials
- key:
- regexp: .*
+  - name: dynamic_query # Query mapping, available as "Data.dynamic_query.<key>"
+  secretQuery:
+  path: /source/credentials
+  key:
+  regexp: .*
 
  target:
  key: /target/example-6