Add E2E repro for convertTimezone (#44705)

e2e/test/scenarios/question-reproductions/reproductions-3.cy.spec.js

@@ -589,6 +589,27 @@ function removeFilter() {
   cy.findByTestId("question-row-count").should("have.text", "Showing 2 rows");
 }
 
+describe("issue 33439", () => {
+  beforeEach(() => {
+    restore();
+    cy.signInAsNormalUser();
+  });
+
+  it("should show an error message when trying to use convertTimezone on an unsupported db (metabase#33439)", () => {
+    openOrdersTable({ mode: "notebook" });
+    addCustomColumn();
+    enterCustomColumnDetails({
+      formula:
+        'convertTimezone("2022-12-28T12:00:00", "Canada/Pacific", "Canada/Eastern")',
+      name: "Date",
+    });
+    popover().within(() => {
+      cy.findByText("Unsupported function convert-timezone");
+      cy.button("Done").should("be.disabled");
+    });
+  });
+});
+
 describe("issue 42244", () => {
   const COLUMN_NAME = "Created At".repeat(5);