Remove an unused `cared` scope from Issue and MergeRequest

app/models/issue.rb

@@ -26,7 +26,6 @@ class Issue < ActiveRecord::Base
 
   validates :project, presence: true
 
-  scope :cared, ->(user) { where(assignee_id: user) }
   scope :in_projects, ->(project_ids) { where(project_id: project_ids) }
 
   scope :without_due_date, -> { where(due_date: nil) }

app/models/merge_request.rb

@@ -104,7 +104,6 @@ class MergeRequest < ActiveRecord::Base
   scope :by_source_or_target_branch, ->(branch_name) do
     where("source_branch = :branch OR target_branch = :branch", branch: branch_name)
   end
-  scope :cared, ->(user) { where('assignee_id = :user OR author_id = :user', user: user.id) }
   scope :by_milestone, ->(milestone) { where(milestone_id: milestone) }
   scope :of_projects, ->(ids) { where(target_project_id: ids) }
   scope :from_project, ->(project) { where(source_project_id: project.id) }

app/models/user.rb

@@ -587,10 +587,6 @@ class User < ActiveRecord::Base
     name.split.first unless name.blank?
   end
 
-  def cared_merge_requests
-    MergeRequest.cared(self)
-  end
-
   def projects_limit_left
     projects_limit - personal_projects.count
   end