Added support for acknowledging code of conduct for using public Notebook Gallery (#117)

* minro code edits

* Added support for acknowledging code of conduct

- Added CodeOfConduct component that shows links and a checkbox that must be acknwledged before seeing the public galley
- Added verbose message for notebook publish error (when another notebook with the same name exists in the gallery)
- Added a feature flag for enabling code of conduct acknowledgement

* Added Info Component

* minor edit

* fixed failign tests

* publish tab displayed only when code of conduct accepted

* added code of conduct fetch during publish

* fixed bug

* added test and addressed PR comments

* changed line endings

* added comment

* addressed PR comments

src/Explorer/Controls/NotebookGallery/CodeOfConductComponent.test.tsx

@@ -0,0 +1,43 @@
+import { shallow } from "enzyme";
+import * as sinon from "sinon";
+import React from "react";
+import { CodeOfConductComponent, CodeOfConductComponentProps } from "./CodeOfConductComponent";
+import { IJunoResponse, JunoClient } from "../../../Juno/JunoClient";
+import { HttpStatusCodes } from "../../../Common/Constants";
+
+describe("CodeOfConductComponent", () => {
+  let sandbox: sinon.SinonSandbox;
+  let codeOfConductProps: CodeOfConductComponentProps;
+
+  beforeEach(() => {
+    sandbox = sinon.sandbox.create();
+    sandbox.stub(JunoClient.prototype, "acceptCodeOfConduct").returns({
+      status: HttpStatusCodes.OK,
+      data: true
+    } as IJunoResponse<boolean>);
+    const junoClient = new JunoClient(undefined);
+    codeOfConductProps = {
+      junoClient: junoClient,
+      onAcceptCodeOfConduct: jest.fn()
+    };
+  });
+
+  afterEach(() => {
+    sandbox.restore();
+  });
+
+  it("renders", () => {
+    const wrapper = shallow(<CodeOfConductComponent {...codeOfConductProps} />);
+    expect(wrapper).toMatchSnapshot();
+  });
+
+  it("onAcceptedCodeOfConductCalled", async () => {
+    const wrapper = shallow(<CodeOfConductComponent {...codeOfConductProps} />);
+    wrapper
+      .find(".genericPaneSubmitBtn")
+      .first()
+      .simulate("click");
+    await Promise.resolve();
+    expect(codeOfConductProps.onAcceptCodeOfConduct).toBeCalled();
+  });
+});