fix: pseudo stacks (#247)

* fix: pseudo stacks

Ensure Azure specific outputs are appended to any that are already in
the state.

With the shared provider looking after pseudo stacks, their content
will already be in the state when the Azure normaliser runs.

* fix: use known behaviour for state combination

azure/inputseeders/azure/id.ftl

@@ -332,6 +332,7 @@
 [/#function]
 
 [#-- Normalise arm stack files to state point sets --]
+[#-- Note that pseudo stacks use the aws format and are handled via the shared provider --]
 [#function azure_configtransformer_normalise filter state]
 
     [#if filterAttributeContainsValue(filter, "Provider", AZURE_PROVIDER) ]
@@ -397,12 +398,15 @@
             [/#if]
         [/#list]
 
+        [#-- Append so as not to loose previously normalised stack info --]
         [#if stackFiles?has_content]
             [#return
                 addToConfigPipelineClass(
                     state,
                     STATE_CONFIG_INPUT_CLASS,
-                    pointSets
+                    pointSets,
+                    "",
+                    APPEND_COMBINE_BEHAVIOUR
                 )
             ]
         [/#if]