Rename Lfs::FileModificationHandler to Lfs::FileTransformer

app/services/files/create_service.rb

 module Files
   class CreateService < Files::BaseService
     def create_commit!
-      handler = Lfs::FileModificationHandler.new(project, @branch_name)
+      handler = Lfs::FileTransformer.new(project, @branch_name)
 
       handler.new_file(@file_path, @file_content) do |content_or_lfs_pointer|
         create_transformed_commit(content_or_lfs_pointer)

app/services/lfs/file_modification_handler.rb → app/services/lfs/file_transformer.rb

 module Lfs
-  class FileModificationHandler
+  class FileTransformer
     attr_reader :project, :branch_name
 
     delegate :repository, to: :project