Resolve final credscan bug (#31196)

.config/CredScanSuppressions.json

@@ -13,6 +13,10 @@
       "placeholder": "newpassword",
       "_justification": "This is a fake password used in test code."
     },
+    {
+      "placeholder": "testpassword",
+      "_justification": "This is a fake password used in test code."
+    },
     {
       "placeholder": "AAABAgMEBQYHCAkKCwwNDg+ukCEMDf0yyQ29NYubggE=",
       "_justification": "This is a fake password hash used in test code."