(AzureCXP) Updating App test automation

Based on customer feedback on below two GitHub threads

#53270 (new thread)
#39190 (old thread)

Based on request #53349 , creating an internal PR 
Please review and let me know if its not feasible to generalize the app tests automation to be optional vs mandatory

Author: BharathNimmala-MSFT

articles/marketplace/partner-center-portal/create-new-business-central-offer.md

@@ -373,7 +373,7 @@ You must upload a `.pdf` file that lists your offer's key usage scenarios listed
 
 ### App tests automation
 
-You can optionally upload an **App tests automation** file here (.app).
+You must upload an **App tests automation** file here (.app).
 
 ### Test accounts