Fix rubocop Rake/MethodDefinitionInTask warnings

.rubocop_todo.yml

@@ -178,11 +178,6 @@ Rake/Desc:
     - 'lib/tasks/subscribe_old_changesets.rake'
     - 'lib/tasks/testing.rake'
 
-# Offense count: 3
-Rake/MethodDefinitionInTask:
-  Exclude:
-    - 'lib/tasks/eslint.rake'
-
 # Offense count: 558
 # Cop supports --auto-correct.
 # Configuration parameters: EnforcedStyle.

lib/tasks/eslint.rake

@@ -1,6 +1,5 @@
 task "eslint" => "eslint:check"
 
-namespace "eslint" do
 def yarn_path
   Rails.root.join("bin/yarn").to_s
 end
@@ -15,6 +14,7 @@ namespace "eslint" do
   end
 end
 
+namespace "eslint" do
   task :check => :environment do
     system(yarn_path, "run", "eslint", "-c", config_file, *js_files) || abort
   end