Add 3 more AL/BC patterns from CURABIS Academy testing course material

Third batch from CURABIS ApS: item-ledger-entry document-no lookup after Ship-and-Invoice posting, TestPage.Visible()/.Enabled() as the mechanism for verifying field UI state, and LibraryUtility.GenerateGUID() for collision-free test fixture values.

microsoft/knowledge/testing/use-testpage-visible-enabled-to-verify-field-ui-state.bad.al

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+codeunit 50131 "Sample Customer Type UI Test"
+{
+    Subtype = Test;
+
+    [Test]
+    procedure CustomerTypeFieldIsEnabledOnCustomerCard()
+    var
+        CustomerCard: TestPage "Customer Card";
+    begin
+        // Confirms only that the page opens - never checks the field's actual UI state
+        CustomerCard.OpenView();
+        CustomerCard.Close();
+    end;
+}