Align project files with CodeHarbor

Since both projects are developed together and by the same team, we also want to have the same code structure and utility methods available in both projects. Therefore, this commit changes many files, but without a functional change.

spec/services/exercise_service/check_external_spec.rb

@@ -2,7 +2,7 @@
 
 require 'rails_helper'
 
-describe ExerciseService::CheckExternal do
+RSpec.describe ExerciseService::CheckExternal do
   describe '.new' do
     subject(:export_service) { described_class.new(uuid:, codeharbor_link:) }
 

spec/services/proforma_service/convert_task_to_exercise_spec.rb

@@ -2,7 +2,7 @@
 
 require 'rails_helper'
 
-describe ProformaService::ConvertTaskToExercise do
+RSpec.describe ProformaService::ConvertTaskToExercise do
   describe '.new' do
     subject(:convert_to_exercise_service) { described_class.new(task:, user:, exercise:) }
 

spec/services/proforma_service/export_task_spec.rb

@@ -2,7 +2,7 @@
 
 require 'rails_helper'
 
-describe ProformaService::ExportTask do
+RSpec.describe ProformaService::ExportTask do
   describe '.new' do
     subject(:export_task) { described_class.new(exercise:) }
 

spec/services/proforma_service/import_spec.rb

@@ -2,7 +2,7 @@
 
 require 'rails_helper'
 
-describe ProformaService::Import do
+RSpec.describe ProformaService::Import do
   describe '.new' do
     subject(:import_service) { described_class.new(zip:, user:) }