Fix `Performance/DeletePrefix` cop (#27448)

.rubocop_todo.yml

@@ -100,12 +100,6 @@ Naming/VariableNumber:
     - 'spec/models/domain_block_spec.rb'
     - 'spec/models/user_spec.rb'
 
-# This cop supports unsafe autocorrection (--autocorrect-all).
-# Configuration parameters: SafeMultiline.
-Performance/DeletePrefix:
-  Exclude:
-    - 'app/models/featured_tag.rb'
-
 Performance/MapMethodChain:
   Exclude:
     - 'app/models/feed.rb'

app/models/featured_tag.rb

@@ -51,7 +51,7 @@ class FeaturedTag < ApplicationRecord
   private
 
   def strip_name
-    self.name = name&.strip&.gsub(/\A#/, '')
+    self.name = name&.strip&.delete_prefix('#')
   end
 
   def set_tag