[Query Copilot] Query Copilot button dropdown and shortcut (#1582)

* Copilot dropdown implementation

* additional changes

* added unit test for key event

* Additional test changes

---------

Co-authored-by: Predrag Klepic <v-prklepic@microsoft.com>

src/Explorer/Tabs/QueryTab/QueryTabComponent.test.tsx

@@ -0,0 +1,34 @@
+import { fireEvent, render } from "@testing-library/react";
+import QueryTabComponent, { IQueryTabComponentProps } from "Explorer/Tabs/QueryTab/QueryTabComponent";
+import { useQueryCopilot } from "hooks/useQueryCopilot";
+import React from "react";
+
+jest.mock("Explorer/Controls/Editor/EditorReact");
+
+describe("QueryTabComponent", () => {
+  const mockStore = useQueryCopilot.getState();
+  beforeEach(() => {
+    mockStore.showCopilotSidebar = false;
+    mockStore.setShowCopilotSidebar = jest.fn();
+  });
+  beforeEach(() => jest.clearAllMocks());
+
+  it("should launch Copilot when ALT+C is pressed", () => {
+    const propsMock: Readonly<IQueryTabComponentProps> = ({
+      collection: { databaseId: "CopilotSampleDb" },
+      onTabAccessor: () => jest.fn(),
+      isExecutionError: false,
+      tabId: "mockTabId",
+      tabsBaseInstance: {
+        updateNavbarWithTabsButtons: () => jest.fn(),
+      },
+    } as unknown) as IQueryTabComponentProps;
+
+    const { container } = render(<QueryTabComponent {...propsMock} />);
+
+    const launchCopilotButton = container.querySelector(".queryEditorWatermarkText");
+    fireEvent.keyDown(launchCopilotButton, { key: "c", altKey: true });
+
+    expect(mockStore.setShowCopilotSidebar).toHaveBeenCalledWith(true);
+  });
+});