Sets a max_height=500px for the TinyMCE editor when editing a Text/Html component.
This prevents the autoresize plugin from expanding the editor textarea beyond the bounds of the editor modal.
⚠️ Because the max height can only be a numeric pixel value, we can't use clever settings like vh or %, and so we're forced to limit the height of the editor to a fixed size for all screen sizes in order to address this issue.
(cherry picked from commit c5f7d0cf3b)
e34df7f270