Add an enum type for the FAILED test report state

doc/api/graphql/reference/gitlab_schema.graphql

@@ -12884,6 +12884,7 @@ type TestReportEdge {
 State of a test report
 """
 enum TestReportState {
+  FAILED
   PASSED
 }
 

doc/api/graphql/reference/gitlab_schema.json

@@ -38002,6 +38002,12 @@
               "description": null,
               "isDeprecated": false,
               "deprecationReason": null
+            },
+            {
+              "name": "FAILED",
+              "description": null,
+              "isDeprecated": false,
+              "deprecationReason": null
             }
           ],
           "possibleTypes": null

ee/app/graphql/types/requirements_management/test_report_state_enum.rb

@@ -7,6 +7,7 @@ module Types
       description 'State of a test report'
 
       value 'PASSED', value: 'passed'
+      value 'FAILED', value: 'failed'
     end
   end
 end

ee/spec/graphql/types/requirements_management/test_report_state_enum_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe GitlabSchema.types['TestReportState'] do
+  it 'exposes all the possible test report states' do
+    expect(described_class.values.keys).to contain_exactly(*%w[PASSED FAILED])
+  end
+end