Run project after import when GitLab Migration is complete

  - In order to refresh project statistics after GitLab
    Migration is complete, run after import set of instructions
    after entity is marked as finished

Changelog: other

app/models/project.rb

@@ -1997,7 +1997,7 @@ class Project < ApplicationRecord
     # of a model instance (e.g. an Issue).
     InternalId.flush_records!(project: self)
 
-    import_state.finish
+    import_state&.finish
     update_project_counter_caches
     after_create_default_branch
     join_pool_repository

lib/bulk_imports/common/pipelines/entity_finisher.rb

@@ -30,6 +30,8 @@ module BulkImports
             pipeline_class: self.class.name,
             message: "Entity #{entity.status_name}"
           )
+
+          context.portable.try(:after_import)
         end
 
         private

spec/lib/bulk_imports/common/pipelines/entity_finisher_spec.rb

@@ -21,6 +21,8 @@ RSpec.describe BulkImports::Common::Pipelines::EntityFinisher do
         )
     end
 
+    expect(context.portable).to receive(:try).with(:after_import)
+
     expect { subject.run }
       .to change(entity, :status_name).to(:finished)
   end