Fix RuboCop Lint/DuplicateMethods todos

Avoid method redefinitions by removing the corresponding
`attr_{reader,writer,accessor}`.

.rubocop_todo.yml

@@ -153,23 +153,6 @@ Layout/SpaceInsideBlockBraces:
 Layout/SpaceInsideParens:
   Enabled: false
 
-# Offense count: 19
-Lint/DuplicateMethods:
-  Exclude:
-    - 'app/models/commit.rb'
-    - 'app/models/note.rb'
-    - 'lib/bitbucket/representation/repo.rb'
-    - 'lib/declarative_policy/base.rb'
-    - 'lib/gitlab/auth/ldap/person.rb'
-    - 'lib/gitlab/auth/o_auth/user.rb'
-    - 'lib/gitlab/ci/build/artifacts/metadata/entry.rb'
-    - 'lib/gitlab/cycle_analytics/base_event_fetcher.rb'
-    - 'lib/gitlab/diff/formatters/base_formatter.rb'
-    - 'lib/gitlab/git/blob.rb'
-    - 'lib/gitlab/git/repository.rb'
-    - 'lib/gitlab/git/tree.rb'
-    - 'lib/gitlab/git/wiki_page.rb'
-
 # Offense count: 157
 # Configuration parameters: MaximumRangeSize.
 Lint/MissingCopEnableDirective:

app/models/commit.rb

@@ -21,7 +21,6 @@ class Commit
   participant :committer
   participant :notes_with_associations
 
-  attr_accessor :author
   attr_accessor :redacted_description_html
   attr_accessor :redacted_title_html
   attr_accessor :redacted_full_title_html

app/models/note.rb

@@ -61,7 +61,7 @@ class Note < ApplicationRecord
   attr_accessor :commands_changes
 
   # A special role that may be displayed on issuable's discussions
-  attr_accessor :special_role
+  attr_reader :special_role
 
   default_value_for :system, false
 

lib/bitbucket/representation/repo.rb

@@ -3,8 +3,6 @@
 module Bitbucket
   module Representation
     class Repo < Representation::Base
-      attr_reader :owner, :slug
-
       def initialize(raw)
         super(raw)
       end

lib/declarative_policy/base.rb

@@ -213,7 +213,7 @@ module DeclarativePolicy
     #
     # It also stores a reference to the cache, so it can be used
     # to cache computations by e.g. ManifestCondition.
-    attr_reader :user, :subject, :cache
+    attr_reader :user, :subject
     def initialize(user, subject, opts = {})
       @user = user
       @subject = subject

lib/gitlab/auth/ldap/person.rb

@@ -11,7 +11,7 @@ module Gitlab
 
         InvalidEntryError = Class.new(StandardError)
 
-        attr_accessor :entry, :provider
+        attr_accessor :provider
 
         def self.find_by_uid(uid, adapter)
           uid = Net::LDAP::Filter.escape(uid)

lib/gitlab/auth/o_auth/user.rb

@@ -12,7 +12,7 @@ module Gitlab
         SignupDisabledError = Class.new(StandardError)
         SigninDisabledForProviderError = Class.new(StandardError)
 
-        attr_accessor :auth_hash, :gl_user
+        attr_reader :auth_hash
 
         def initialize(auth_hash)
           self.auth_hash = auth_hash

lib/gitlab/ci/build/artifacts/metadata/entry.rb

@@ -16,7 +16,7 @@ module Gitlab
           #
           class Entry
             attr_reader :entries
-            attr_accessor :name
+            attr_writer :name
 
             def initialize(path, entries)
               @entries = entries

lib/gitlab/cycle_analytics/base_event_fetcher.rb

@@ -6,7 +6,7 @@ module Gitlab
       include BaseQuery
       include GroupProjectsProvider
 
-      attr_reader :projections, :query, :stage, :order, :options
+      attr_reader :projections, :query, :stage, :options
 
       MAX_EVENTS = 50
 

lib/gitlab/diff/formatters/base_formatter.rb

@@ -10,7 +10,6 @@ module Gitlab
         attr_reader :base_sha
         attr_reader :start_sha
         attr_reader :head_sha
-        attr_reader :position_type
 
         def initialize(attrs)
           if diff_file = attrs[:diff_file]

lib/gitlab/git/blob.rb

@@ -25,7 +25,8 @@ module Gitlab
       LFS_POINTER_MIN_SIZE = 120.bytes
       LFS_POINTER_MAX_SIZE = 200.bytes
 
-      attr_accessor :name, :path, :size, :data, :mode, :id, :commit_id, :loaded_size, :binary
+      attr_accessor :size, :mode, :id, :commit_id, :loaded_size, :binary
+      attr_writer :name, :path, :data
 
       define_counter :gitlab_blob_truncated_true do
         docstring 'blob.truncated? == true'

lib/gitlab/git/repository.rb

@@ -44,7 +44,7 @@ module Gitlab
       # Relative path of repo
       attr_reader :relative_path
 
-      attr_reader :storage, :gl_repository, :relative_path, :gl_project_path
+      attr_reader :storage, :gl_repository, :gl_project_path
 
       # This remote name has to be stable for all types of repositories that
       # can join an object pool. If it's structure ever changes, a migration

lib/gitlab/git/tree.rb

@@ -6,8 +6,8 @@ module Gitlab
       include Gitlab::EncodingHelper
       extend Gitlab::Git::WrapsGitalyErrors
 
-      attr_accessor :id, :root_id, :name, :path, :flat_path, :type,
-        :mode, :commit_id, :submodule_url
+      attr_accessor :id, :root_id, :type, :mode, :commit_id, :submodule_url
+      attr_writer :name, :path, :flat_path
 
       class << self
         # Get list of tree objects

lib/gitlab/git/wiki_page.rb

@@ -3,7 +3,7 @@
 module Gitlab
   module Git
     class WikiPage
-      attr_reader :url_path, :title, :format, :path, :version, :raw_data, :name, :text_data, :historical, :formatted_data
+      attr_reader :url_path, :title, :format, :path, :version, :raw_data, :name, :historical, :formatted_data
 
       # This class abstracts away Gitlab::GitalyClient::WikiPage
       def initialize(gitaly_page, version)