Ignore requirements_management_test_reports.requirement_id column

We removed relationship between requirements and test reports as
part of deprecation process of Requirement objects. Now requirement_id
column can be ignored to be removed in the next release.

Changelog: other
EE: true

ee/app/models/requirements_management/test_report.rb

@@ -2,9 +2,12 @@
 
 module RequirementsManagement
   class TestReport < ApplicationRecord
+    include IgnorableColumns
     include Sortable
     include BulkInsertSafe
 
+    ignore_column :requirement_id, remove_with: '14.10', remove_after: '2022-03-22'
+
     belongs_to :author, inverse_of: :test_reports, class_name: 'User'
     belongs_to :build, class_name: 'Ci::Build'
     belongs_to :requirement_issue, class_name: 'Issue', foreign_key: :issue_id