Image Customizer: remove adduser-config.yaml file as it contains password field (#7298)

.config/CredScanSuppressions.json

@@ -28,10 +28,6 @@
         {
             "file": "\\toolkit\\tools\\imagecustomizer\\docs\\configuration.md",
             "_justification": "Secrets from documentation samples. No production secrets."
-        },
-        {
-            "file": "\\toolkit\\tools\\pkg\\imagecustomizerlib\\testdata\\addusers-config.yaml",
-            "_justification": "Dummy secrets used to unit test configuration code."
         }
     ]
 }

toolkit/tools/pkg/imagecustomizerlib/testdata/addusers-config.yaml

@@ -1,10 +0,0 @@
-SystemConfig:
-  Users:
-  - Name: root
-    Password: password
-
-  - Name: test
-    Password: $6$aEzRqlIsXn8I$uvdD6RgzdAao5qUxap/Edc/ABW2Qfvqe4ZK7AjoguwS1rX2Q5l72/4L4OW5lqOdY5pIIahBco3hdR32NAuZ/O1
-    PasswordHashed: true
-    SecondaryGroups:
-    - sudo

toolkit/tools/pkg/osmodifierlib/testdata/addusers-config.yaml

@@ -1,9 +0,0 @@
-Users:
-- Name: root
-  Password: password
-
-- Name: test
-  Password: $6$aEzRqlIsXn8I$uvdD6RgzdAao5qUxap/Edc/ABW2Qfvqe4ZK7AjoguwS1rX2Q5l72/4L4OW5lqOdY5pIIahBco3hdR32NAuZ/O1
-  PasswordHashed: true
-  SecondaryGroups:
-  - sudo