Remove User#tm_in_authorized_projects and User#tm_of

These methods seems to be unused.
Signed-off-by: Rémy Coutable <remy@rymai.me>

app/models/user.rb

@@ -397,11 +397,6 @@ class User < ActiveRecord::Base
                     owned_groups.select(:id), namespace.id).joins(:namespace)
   end
 
-  # Team membership in authorized projects
-  def tm_in_authorized_projects
-    ProjectMember.where(source_id: authorized_projects.map(&:id), user_id: self.id)
-  end
-
   def is_admin?
     admin
   end
@@ -491,10 +486,6 @@ class User < ActiveRecord::Base
     "#{name} (#{username})"
   end
 
-  def tm_of(project)
-    project.project_member_by_id(self.id)
-  end
-
   def already_forked?(project)
     !!fork_of(project)
   end