Addon-highlight: Convert to simplified addon style

[shilman]

Issue: N/A

What I did

Converted the highlight to the new simplified preview/manager.js style per #17755

@winkerVSbecks Not sure if I'm doing something wrong:

• this PR doesn't work per the test below
• neither does Essentials: Add highlight addon #17800
• next does work

How to test

yarn bootstrap --core
cd examples/html-kitchen-sink
yarn storybook
# use a11y addon

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[winkerVSbecks]

@shilman some of the examples don't use addon-essentials. I've updated them to use the addon-highlight. The test should pass now.

[shilman]

@winkerVSbecks that makes sense. doesn't that make this a breaking change then, since users of addon-a11y will need to install addon-highlight? if so, i think we need to wait until 7.0 to merge this.

[winkerVSbecks]

Yea that makes sense. My assumption was that including it in essentials would avoid that issue. I'll merge you PR for now and then hold off on mine until 7.0