Revert "Updated the sent_requests cache when a user accepts a friendship request so that the request disappears from the list of sent requests"

This reverts commit e6a47f557ab89bd31bcfc5aea84ab3695d945631.
Revert "Revert "Updated the sent_requests cache when a user accepts a friendship request so that the request disappears from the list of sent requests""

This reverts commit 71818efd1081235460a7c0e5b98cc18d706c76f3.
Removing last modification: no need for reject