Change esc_html to strip_tags for displayName in _format_author_data function in class-coauthors-endpoint.php

[thedanielcho]

Description

This is a fix for #937 (comment) where I switched out the esc_html function call for strip_tags for the displayName to fix an apostrophe display issue on the post-edit page.

Should include any special considerations, decisions, and links to relevant GitHub issues.

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[GaryJones]

Thanks, Daniel.

I'm not convinced that the escaping should be done before the REST response is sent back since there's no idea of what context that escaping should be for - will it be for HTML, an attribute, XML, or something else? Needs an investigation.