Repro #29094 - Notebook filter field allows non boolean custom expressions (#39502)

* Add repro for #29094

* Use arrow function

e2e/test/scenarios/filters/reproductions/29094-non-boolean-custom-expressions.cy.spec.js

+import {
+  enterCustomColumnDetails,
+  getNotebookStep,
+  popover,
+  restore,
+  startNewQuestion,
+} from "e2e/support/helpers";
+
+describe("issue 29094", () => {
+  beforeEach(() => {
+    restore();
+    cy.signInAsNormalUser();
+  });
+
+  it("disallows adding a filter using non-boolean custom expression (metabase#29094)", () => {
+    startNewQuestion();
+
+    popover().within(() => {
+      cy.findByText("Raw Data").click();
+      cy.findByText("Orders").click();
+    });
+
+    getNotebookStep("filter")
+      .findByText("Add filters to narrow your answer")
+      .click();
+
+    popover().within(() => {
+      cy.findByText("Custom Expression").click();
+      enterCustomColumnDetails({ formula: "[Tax] * 22" });
+      cy.realPress("Tab");
+      cy.button("Done").should("be.disabled");
+      cy.findByText("Invalid expression").should("exist");
+    });
+  });
+});