Convert highlight-mark component to be Drupal 8-compatible

Problem/Motivation

As described in #2716773: [Meta] Convert 7.x-6.x Twig components to be Drupal 8-compatible, we need to convert the highlight-mark component from Zen 7.x-6.x to be compatible with Drupal 8.

Proposed resolution

The parent issue describes the general solution we need to use when converting a component.

Solutions specific to the highlight-mark component should be added here as we figure them out.

Remaining tasks

Everything