Use actual activated at value for license type

Prior to this change, the value for activated at in the GraphQL
Types::Admin::CloudLicenses::LicenseType class was using created at
since the field didn't exist before. Now that the field exists in the
Gitlab::License we can use the actual value and implement a fallback to
created at for older licenses.

Gemfile

@@ -298,7 +298,7 @@ gem 'gon', '~> 6.4.0'
 gem 'request_store', '~> 1.5'
 gem 'base32', '~> 0.3.0'
 
-gem "gitlab-license", "~> 1.3"
+gem "gitlab-license", "~> 1.4"
 
 # Protect against bruteforcing
 gem 'rack-attack', '~> 6.3.0'

Gemfile.lock

@@ -475,7 +475,7 @@ GEM
       opentracing (~> 0.4)
       pg_query (~> 1.3)
       redis (> 3.0.0, < 5.0.0)
-    gitlab-license (1.3.1)
+    gitlab-license (1.4.0)
     gitlab-mail_room (0.0.9)
     gitlab-markup (1.7.1)
     gitlab-net-dns (0.9.1)
@@ -1436,7 +1436,7 @@ DEPENDENCIES
   gitlab-fog-azure-rm (~> 1.0.1)
   gitlab-fog-google (~> 1.13)
   gitlab-labkit (~> 0.16.2)
-  gitlab-license (~> 1.3)
+  gitlab-license (~> 1.4)
   gitlab-mail_room (~> 0.0.9)
   gitlab-markup (~> 1.7.1)
   gitlab-net-dns (~> 0.9.1)

ee/app/graphql/types/admin/cloud_licenses/license_type.rb

@@ -37,8 +37,7 @@ module Types
                 description: 'Date when the license expires.'
 
           field :activated_at, ::Types::DateType, null: true,
-                description: 'Date when the license was activated.',
-                method: :created_at
+                description: 'Date when the license was activated.'
 
           field :users_in_license_count, GraphQL::INT_TYPE, null: true,
                 description: 'Number of paid users in the license.',

ee/app/models/license.rb

@@ -589,6 +589,10 @@ class License < ApplicationRecord
     end
   end
 
+  def activated_at
+    super || created_at
+  end
+
   private
 
   def restricted_attr(name, default = nil)

ee/spec/models/license_spec.rb

@@ -1523,4 +1523,25 @@ RSpec.describe License do
 
     it { is_expected.to eq('Example Inc.') }
   end
+
+  describe '#activated_at' do
+    subject { license.activated_at }
+
+    let(:license) do
+      gl_license = build(:gitlab_license, activated_at: activated_at)
+      build(:license, data: gl_license.export, created_at: 5.days.ago)
+    end
+
+    context 'when activated_at is set within the license data' do
+      let(:activated_at) { Date.yesterday.to_datetime }
+
+      it { is_expected.to eq(activated_at) }
+    end
+
+    context 'when activated_at is not set within the license data' do
+      let(:activated_at) { nil }
+
+      it { is_expected.to eq(license.created_at) }
+    end
+  end
 end