Remove enableGallery feature flag (#68)

* Remove enableGallery feature flag

* Fix bugs

* Add tests to increase coverage

* Move favorites functionality behind feature.enableGalleryPublish flag

* Show code cells in NotebookViewer

* Use cosmos db logo as persona image for sample notebook gallery cards

* Update gallery card snapshot to fix test

src/Utils/UserUtils.test.ts

@@ -0,0 +1,24 @@
+import AuthHeadersUtil from "../Platform/Hosted/Authorization";
+import * as UserUtils from "./UserUtils";
+
+describe("UserUtils", () => {
+  it("getFullName works in regular data explorer (inside portal)", () => {
+    const user: AuthenticationContext.UserInfo = {
+      userName: "userName",
+      profile: {
+        name: "name"
+      }
+    };
+    AuthHeadersUtil.getCachedUser = jest.fn().mockReturnValue(user);
+
+    expect(UserUtils.getFullName()).toBe("name");
+  });
+
+  it("getFullName works in fullscreen data explorer (outside portal)", () => {
+    jest.mock("./AuthorizationUtils", () => {
+      (): { name: string } => ({ name: "name" });
+    });
+
+    expect(UserUtils.getFullName()).toBe("name");
+  });
+});