[EventListener] Remove deprecated lifecycle method

[AndrewMusgrave]

WHY are these changes introduced?

Part of #519

WHAT is this pull request doing?

• Replaces lifecycle method
• Add test

How to 🎩

Copy-paste this code in playground/Playground.tsx:

import * as React from 'react';
import {Page, AppProvider, Button, EventListener} from '@shopify/polaris';

interface State {
  event: 'resize' | 'scroll';
}

export default class CollapsibleExample extends React.Component<never, State> {
  state: State = {
    event: 'resize',
  };

  render() {
    const {event} = this.state;
    const lines = Array.from({length: 100}, (n: number) => <br key={n} />);

    return (
      <AppProvider>
        <Page title="test">
          <EventListener event={event} handler={() => console.log(event)} />
          <Button onClick={this.handleToggleClick}>
            Current listener {event}
            <br />
            Previous listener {this.getEvent()}
          </Button>
          {lines}
        </Page>
      </AppProvider>
    );
  }

  handleToggleClick = () => {
    this.setState({event: this.getEvent()});
  };

  getEvent() {
    const {event} = this.state;
    return event === 'scroll' ? 'resize' : 'scroll';
  }
}

[solonaarmstrong-zz]

I 🎩 with Popover and 👍 Code makes sense. Just needs a rebase.