Rename CsvIssueImport to Issues::CsvImport

We want to namespace relevant concepts so that it is easier to
understand the role of similarly, or ambiguously named concepts. Rename
CsvIssueImport to Issues::CsvImport which was recently introduced in
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/44742 so that it
aligns with this ideal.

Issue: https://gitlab.com/gitlab-org/gitlab/-/issues/270428

app/models/csv_issue_import.rb → app/models/issues/csv_import.rb

 # frozen_string_literal: true
 
-class CsvIssueImport < ApplicationRecord
+class Issues::CsvImport < ApplicationRecord
+  self.table_name = 'csv_issue_imports'
+
   belongs_to :project, optional: false
   belongs_to :user, optional: false
 end

app/services/issues/import_csv_service.rb

@@ -20,7 +20,7 @@ module Issues
     private
 
     def record_import_attempt
-      CsvIssueImport.create!(user: @user, project: @project)
+      Issues::CsvImport.create!(user: @user, project: @project)
     end
 
     def process_csv

lib/gitlab/usage_data.rb

@@ -602,7 +602,7 @@ module Gitlab
             jira: distinct_count(::JiraImportState.where(time_period), :user_id),
             fogbugz: projects_imported_count('fogbugz', time_period),
             phabricator: projects_imported_count('phabricator', time_period),
-            csv: distinct_count(CsvIssueImport.where(time_period), :user_id)
+            csv: distinct_count(Issues::CsvImport.where(time_period), :user_id)
           },
           groups_imported: distinct_count(::GroupImportState.where(time_period), :user_id)
         }

spec/factories/csv_issue_import.rb → spec/factories/issues/csv_import.rb

 # frozen_string_literal: true
 
 FactoryBot.define do
-  factory :csv_issue_import do
+  factory :issue_csv_import, class: 'Issues::CsvImport' do
     project
     user
   end

spec/lib/gitlab/usage_data_spec.rb

@@ -212,7 +212,7 @@ RSpec.describe Gitlab::UsageData, :aggregate_failures do
         jira_project = create(:project, creator_id: user.id)
         create(:jira_import_state, :finished, project: jira_project)
 
-        create(:csv_issue_import, user: user)
+        create(:issue_csv_import, user: user)
       end
 
       expect(described_class.usage_activity_by_stage_manage({})).to include(

spec/models/csv_issue_import_spec.rb → spec/models/issues/csv_import_spec.rb

@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe CsvIssueImport, type: :model do
+RSpec.describe Issues::CsvImport, type: :model do
   describe 'associations' do
     it { is_expected.to belong_to(:project).required }
     it { is_expected.to belong_to(:user).required }

spec/services/issues/import_csv_service_spec.rb

@@ -16,7 +16,7 @@ RSpec.describe Issues::ImportCsvService do
   shared_examples_for 'an issue importer' do
     it 'records the import attempt' do
       expect { subject }
-        .to change { CsvIssueImport.where(project: project, user: user).count }
+        .to change { Issues::CsvImport.where(project: project, user: user).count }
         .by 1
     end
   end