Add security training providers

- Migration for adding two providers
- Add related specs

Changelog: added
MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/81104

db/post_migrate/20220305223212_add_security_training_providers.rb

+# frozen_string_literal: true
+
+class AddSecurityTrainingProviders < Gitlab::Database::Migration[1.0]
+  KONTRA_DATA = {
+    name: 'Kontra',
+    description: "Kontra Application Security provides interactive developer security education that
+                  enables engineers to quickly learn security best practices
+                  and fix issues in their code by analysing real-world software security vulnerabilities.",
+    url: "https://application.security/api/webhook/gitlab/exercises/search"
+  }
+
+  SCW_DATA = {
+    name: 'Secure Code Warrior',
+    description: "Resolve vulnerabilities faster and confidently with highly relevant and bite-sized secure coding learning.",
+    url: "https://integration-api.securecodewarrior.com/api/v1/trial"
+  }
+
+  module Security
+    class TrainingProvider < ActiveRecord::Base
+      self.table_name = 'security_training_providers'
+    end
+  end
+
+  def up
+    current_time = Time.current
+    timestamps = { created_at: current_time, updated_at: current_time }
+
+    Security::TrainingProvider.reset_column_information
+
+    # upsert providers
+    Security::TrainingProvider.upsert_all([KONTRA_DATA.merge(timestamps), SCW_DATA.merge(timestamps)])
+  end
+
+  def down
+    Security::TrainingProvider.reset_column_information
+
+    Security::TrainingProvider.find_by(name: KONTRA_DATA[:name])&.destroy
+    Security::TrainingProvider.find_by(name: SCW_DATA[:name])&.destroy
+  end
+end

db/schema_migrations/20220305223212

+8a0e80b6df1d942e5ec23641c935103cddd96c044e2a960b88bb38284cf4d070
\ No newline at end of file

spec/migrations/20220305223212_add_security_training_providers_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+require_migration!
+
+RSpec.describe AddSecurityTrainingProviders, :migration do
+  include MigrationHelpers::WorkItemTypesHelper
+
+  let_it_be(:security_training_providers) { table(:security_training_providers) }
+
+  it 'creates default data' do
+    # Need to delete all as security training providers are seeded before entire test suite
+    security_training_providers.delete_all
+
+    reversible_migration do |migration|
+      migration.before -> {
+        expect(security_training_providers.count).to eq(0)
+      }
+
+      migration.after -> {
+        expect(security_training_providers.count).to eq(2)
+      }
+    end
+  end
+end