New Select: Try it out with some core components (#92826)

* Export Combobox and add portalling

* Use floatingui fixed strategy and fix z-index

* Check non null

* Make value string type only

* Try with fiscal year setting

* Use combobox for WeekStartPicker

* Improve screen reader handling

* Fix faulty import

* Fix type issue

* Fix failing tests and export unstable

* Rename option and remove export

* Use comboboxMockSetup function

* Add support for number type

* menuClosed styles to emotion

public/test/helpers/comboboxTestSetup.ts

@@ -0,0 +1,17 @@
+/**
+ *  Needed for Combobox virtual list. The numbers are arbitrary and just need to be consistent.
+ */
+export const comboboxTestSetup = () => {
+  const mockGetBoundingClientRect = jest.fn(() => ({
+    width: 120,
+    height: 120,
+    top: 0,
+    left: 0,
+    bottom: 0,
+    right: 0,
+  }));
+
+  Object.defineProperty(Element.prototype, 'getBoundingClientRect', {
+    value: mockGetBoundingClientRect,
+  });
+};