Before this commit, the form view in project sharing was always in
legacy. Moreover, in that view, the chatter used is the portal one
and so it is also a legacy widget.
This commit converts the form view and then convert the chatter in
OWL to be able to correctly compile and add the chatter in the form
view.
Also, some styling has been done to remove the overflow. Only the
overflow on the y axis in the chatter can be scrolled on the page.
task-2947516
X-original-commit: 175430f3593337ce582cbec644b9d630894c074b