Defect2271490 (#1474)

* arialabel has been added to close button of invitational youtube video

* heading role has been addedd and tag has been changed to h1

* outline has been restored to choose columns link in entities page

* header text color changed to meet luminosity ratio requirement

* capacity calculator link has been added with underline on focus

* add property is readout twice while using screenreader

* arialabel added to the add property button

* screenreader content changed to announce the entire alert

* alert message is partially readout on error

* Update fulldatatables.less

* Update queryBuilder.less

* Update TableEntity.tsx

* Update ThroughputInput.less

* Update ThroughputInput.tsx

* Update ThroughputInput.test.tsx.snap

* Update NewVertexComponent.tsx

* Update PanelInfoErrorComponent.tsx

* Update AddTableEntityPanel.tsx

* Update AddTableEntityPanel.test.tsx.snap

* Update SplashScreen.tsx

* Update QuickstartCarousel.tsx

* Update RightPaneForm.tsx

* Update fulldatatables.less

src/Explorer/Panes/RightPaneForm/RightPaneForm.test.tsx

@@ -1,5 +1,5 @@
 import { fireEvent, render, screen } from "@testing-library/react";
-import { mount, ReactWrapper } from "enzyme";
+import { ReactWrapper, mount } from "enzyme";
 import React from "react";
 import { RightPaneForm } from "./RightPaneForm";
 
@@ -34,6 +34,6 @@ describe("Right Pane Form", () => {
   it("should render error in header", () => {
     render(<RightPaneForm {...props} formError="file already Exist" />);
     expect(screen.getByLabelText("error")).toBeDefined();
-    expect(screen.getByRole("alert").innerHTML).toEqual("file already Exist");
+    expect(screen.getByRole("alert").innerHTML).toContain("file already Exist");
   });
 });