cubicweb #4236987 views: no escape special char in csvexport on final EType [in-progress]

Where there is a String column, if there are some char such as <`, ``> or & (chevron can occur in the email address in the committer field on the forge, related to a revision), hte CSV content can look like &lt;;.

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patch[views] no escape special chars for the 'csvexport' view (closes #4236987) [rejected]