Chomp: prefer String#chomp where we can for a clarity boost

Closes #24766, #24767

Signed-off-by: Jeremy Daer <jeremydaer@gmail.com>

activejob/test/support/integration/test_case_helpers.rb

@@ -1,4 +1,5 @@
 require 'active_support/concern'
+require 'active_support/core_ext/string/inflections'
 require 'support/integration/jobs_manager'
 
 module TestCaseHelpers
@@ -28,7 +29,8 @@ module TestCaseHelpers
     end
 
     def adapter_is?(*adapter_class_symbols)
-      adapter_class_symbols.map(&:to_s).include?(ActiveJob::Base.queue_adapter.class.name.split("::").last.gsub(/Adapter$/, '').underscore)
+      adapter = ActiveJob::Base.queue_adapter.class.name.demodulize.chomp('Adapter').underscore
+      adapter_class_symbols.map(&:to_s).include? adapter
     end
 
     def wait_for_jobs_to_finish_for(seconds=60)

activemodel/lib/active_model/validations/acceptance.rb

@@ -64,11 +64,7 @@ module ActiveModel
         private
 
         def convert_to_reader_name(method_name)
-          attr_name = method_name.to_s
-          if attr_name.end_with?("=")
-            attr_name = attr_name[0..-2]
-          end
-          attr_name
+          method_name.to_s.chomp('=')
         end
       end
     end

activemodel/lib/active_model/validator.rb

@@ -100,7 +100,7 @@ module ActiveModel
     #   PresenceValidator.kind   # => :presence
     #   UniquenessValidator.kind # => :uniqueness
     def self.kind
-      @kind ||= name.split('::').last.underscore.sub(/_validator$/, '').to_sym unless anonymous?
+      @kind ||= name.split('::').last.underscore.chomp('_validator').to_sym unless anonymous?
     end
 
     # Accepts options that will be made available through the +options+ reader.