Move testing knowledge from community to microsoft layer

Relocates the six P1+P2 testing-domain articles (18 files: .md + .good.al + .bad.al each) from community/knowledge/testing/ to microsoft/knowledge/testing/ per maintainer request. Pure git-mv rename; no content or frontmatter changes.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

microsoft/knowledge/testing/ui-calls-require-test-handlers.bad.al

@@ -0,0 +1,26 @@
+codeunit 50401 "Test UI Handlers Bad"
+{
+    Subtype = Test;
+
+    // No [HandlerFunctions] and no ConfirmHandler: the Confirm below has
+    // nothing to intercept it, so this test fails at runtime with an
+    // "unhandled UI" error before any assertion is evaluated.
+    [Test]
+    procedure DeleteDocumentConfirmsAndProceeds()
+    var
+        Deleted: Boolean;
+    begin
+        Deleted := TryDeleteWithConfirm();
+        Assert.IsTrue(Deleted, 'Routine should proceed after confirmation.');
+    end;
+
+    local procedure TryDeleteWithConfirm(): Boolean
+    begin
+        if not Confirm('Delete this document?', false) then
+            exit(false);
+        exit(true);
+    end;
+
+    var
+        Assert: Codeunit "Library Assert";
+}