[Automatic Import] Fix deploy error after editing the pipeline (#194203)

## Release Note

Fixes a bug that is causing the deploy step to fail after a pipeline
edit/save.

## Summary

#190407 introduced a bug that deployment fails when a pipeline is edited
and saved in the review step.

The issue is that after the edit pipeline flow is executed the review
step's result is overridden and `samplesFormat` is removed which if not
present [the `useEffect` in Deploy
step](https://github.com/elastic/kibana/blob/main/x-pack/plugins/integration_assistant/public/components/create_integration/create_integration_assistant/steps/deploy_step/use_deploy_integration.ts#L41)
fails.

This PR fixes the issue by saving the `samplesFormat` that is present in
the original result before the edit pipeline flow is executed there by
having samplesFormat in the result.

(cherry picked from commit 6366dc3)

x-pack/plugins/integration_assistant/public/components/create_integration/create_integration_assistant/state.ts

@@ -51,7 +51,11 @@ export const reducer = (state: State, action: Action): State => {
     case 'SET_IS_GENERATING':
       return { ...state, isGenerating: action.payload };
     case 'SET_GENERATED_RESULT':
-      return { ...state, result: action.payload };
+      return {
+        ...state,
+        // keep original result as the samplesFormat is not always included in the payload
+        result: state.result ? { ...state.result, ...action.payload } : action.payload,
+      };
     default:
       return state;
   }