Added self cert password suppression

Author: timayabi2020

.azure-pipelines/config/credscan/credscan-suppressions.json

@@ -5,9 +5,14 @@
       "placeholder": "pa$$w0rd",
       "_justification": "[Applications] hard code password in application password HTTP example"
     },
+    {
+      "placeholder": "P@55w0rd",
+      "_justification": "[AuthenticationTests] hard code password in AuthenticationTest for self signed certificate"
+    },
     {
       "file": [
         "src\\Authentication\\Authentication\\test\\Get-MgContext.Tests.ps1",
+        "src\\Authentication\\Authentication.Test\\Helpers\\AuthenticationHelpersTests.cs",
         "src\\Authentication\\Authentication.Test\\Helpers\\AuthenticationHelpersTests.cs"
       ],
       "_justification": "[Authentication] Examples contain random values recognized as secret"