Rename HighlightData to RenderHighlight and SelectionRangeData to RenderSelection as part of rename work to clarify classes around highlights.
<rdar://problem/115589022>
Pull request: https://github.com/WebKit/WebKit/pull/17837
Committed 268089@main (ab192be42c5e): <https://commits.webkit.org/268089@main> Reviewed commits have been landed. Closing PR #17837 and removing active labels.