Rename Files::DeleteService to Files::DestroyService

Reason for renaming is to comply with naming convention of services in
codebase.

app/controllers/projects/blob_controller.rb

@@ -61,7 +61,7 @@ class Projects::BlobController < Projects::ApplicationController
   end
 
   def destroy
-    create_commit(Files::DeleteService, success_notice: "The file has been successfully deleted.",
+    create_commit(Files::DestroyService, success_notice: "The file has been successfully deleted.",
                                          success_path: namespace_project_tree_path(@project.namespace, @project, @target_branch),
                                          failure_view: :show,
                                          failure_path: namespace_project_blob_path(@project.namespace, @project, @id))

app/services/files/destroy_service.rb

@@ -1,5 +1,5 @@
 module Files
-  class DeleteService < Files::BaseService
+  class DestroyService < Files::BaseService
     def commit
       repository.remove_file(
         current_user,

changelogs/unreleased/rename_files_delete_service.yml

@@ -0,0 +1,4 @@
+---
+title: Rename Files::DeleteService to Files::DestroyService
+merge_request: 9110
+author: dixpac

lib/api/files.rb

@@ -117,7 +117,7 @@ module API
         authorize! :push_code, user_project
 
         file_params = declared_params(include_missing: false)
-        result = ::Files::DeleteService.new(user_project, current_user, commit_params(file_params)).execute
+        result = ::Files::DestroyService.new(user_project, current_user, commit_params(file_params)).execute
 
         if result[:status] == :success
           status(200)

spec/lib/gitlab/diff/position_tracer_spec.rb

@@ -122,7 +122,7 @@ describe Gitlab::Diff::PositionTracer, lib: true do
   end
 
   def delete_file(branch_name, file_name)
-    Files::DeleteService.new(
+    Files::DestroyService.new(
       project,
       current_user,
       start_branch: branch_name,