Repro #30312 - Cannot filter directly from table column header when Question is Summarized (#39500)

* Add repro for #30312

* Use arrow function

* Improve assertions

e2e/test/scenarios/filters/reproductions/30312-drill-filter-on-aggregated-column.cy.spec.js

+import { SAMPLE_DATABASE } from "e2e/support/cypress_sample_database";
+import { popover, queryBuilderMain, restore } from "e2e/support/helpers";
+
+const { ORDERS, ORDERS_ID } = SAMPLE_DATABASE;
+
+const CREATED_AT_BREAKOUT = [
+  "field",
+  ORDERS.CREATED_AT,
+  {
+    "base-type": "type/DateTime",
+    "temporal-unit": "month",
+  },
+];
+
+describe("issue 30312", () => {
+  beforeEach(() => {
+    restore();
+    cy.signInAsNormalUser();
+  });
+
+  it("can use a drill filter on an aggregated column (metabase#30312)", () => {
+    cy.createQuestion(
+      {
+        query: {
+          "source-table": ORDERS_ID,
+          aggregation: [["count"]],
+          breakout: [CREATED_AT_BREAKOUT],
+          limit: 5, // optimization
+        },
+        display: "table",
+      },
+      { visitQuestion: true },
+    );
+
+    cy.findAllByTestId("header-cell")
+      .eq(1)
+      .should("have.text", "Count")
+      .click();
+
+    popover().within(() => {
+      cy.findByText("Filter by this column").click();
+      cy.findByPlaceholderText("Enter a number").type("10");
+      cy.realPress("Tab");
+      cy.button("Add filter").should("be.enabled").click();
+    });
+
+    cy.findByTestId("filter-pill").should("have.text", "Count is equal to 10");
+    queryBuilderMain().findByText("No results!").should("be.visible");
+  });
+});