[Query Copilot V2] Unit tests for V2 Copilot (#1580)

* Add tests for V2 of copilot and fix query parameter feature flag

* Fix merge changes

src/Explorer/QueryCopilot/V2/Header/Header.test.tsx

@@ -1,10 +1,17 @@
+import { IconButton } from "@fluentui/react";
 import { shallow } from "enzyme";
+import { useQueryCopilot } from "hooks/useQueryCopilot";
 import React from "react";
 import { Header } from "./Header";
 
 describe("Header snapshot test", () => {
-  it("should render ", () => {
+  it("should close on button click ", () => {
     const wrapper = shallow(<Header />);
+
+    const iconButton = wrapper.find(IconButton).first();
+    iconButton.simulate("click", {});
+
+    expect(useQueryCopilot.getState().showCopilotSidebar).toBeFalsy();
     expect(wrapper).toMatchSnapshot();
   });
 });