Remove diff_preview_in_email feature flag
What does this MR do and why?
Removes diff_preview_in_email feature flag, fully enabling the feature.
Related to #382055 (closed) and #466107 (closed)
Edited by Kerri Miller
Removes diff_preview_in_email feature flag, fully enabling the feature.
Related to #382055 (closed) and #466107 (closed)