fix: enable passport-azure-ad workaround for SameSite cookies (#2567)

This adds cookieEncryptionKeyString configuration in the Azure AD
authentication module.  It represents an array of cookie encryption
strings and enables workaround for SameSite cookies.

server/modules/authentication/azure/definition.yml

@@ -22,4 +22,8 @@ props:
     title: Client ID
     hint: The client ID of your application in AAD (Azure Active Directory)
     order: 2
-
+  cookieEncryptionKeyString:
+    type: String
+    title: Cookie Encryption Key String
+    hint: Random string with 44-character length.  Setting this enables workaround for Chrome's SameSite cookies.
+    order: 3