Fix module assessment generation issues

- Corrected unit order in index.yml (moved summary to end)
- Updated unit sequence to reflect platform-workloads before infrastructure-workloads
- Enabled module_assessment in knowledge check unit

Author: staleycyn

learn-pr/wwl-azure/design-ai-workloads/9-knowledge-check.yml

@@ -8,7 +8,7 @@ metadata:
   author: wwlpublish
   ms.author: cynthist
   ms.topic: unit
-  module_assessment: false
+  module_assessment: true
 durationInMinutes: 3
 content: |
   [!include[](includes/9-knowledge-check.md)]

learn-pr/wwl-azure/design-ai-workloads/index.yml

@@ -34,14 +34,14 @@ subjects:
 - solution-design
 units:
 - learn.wwl.design-ai-workloads.introduction
-- learn.wwl.design-ai-workloads.summary
 - learn.wwl.design-ai-workloads.strategy
 - learn.wwl.design-ai-workloads.adoption-plan
-- learn.wwl.design-ai-workloads.infrastructure-workloads
 - learn.wwl.design-ai-workloads.platform-workloads
+- learn.wwl.design-ai-workloads.infrastructure-workloads
 - learn.wwl.design-ai-workloads.governance
 - learn.wwl.design-ai-workloads.secure-workloads
 - learn.wwl.design-ai-workloads.manage
 - learn.wwl.design-ai-workloads.knowledge-check
+- learn.wwl.design-ai-workloads.summary
 badge:
   uid: learn.wwl.design-ai-workloads.badge