Fix duplicate github annotations for rspec failures (#27450)

.github/workflows/test-ruby.yml

@@ -113,6 +113,7 @@ jobs:
       CAS_ENABLED: true
       BUNDLE_WITH: 'pam_authentication test'
       CI_JOBS: ${{ matrix.ci_job }}/4
+      GITHUB_RSPEC: ${{ matrix.ruby-version == '.ruby-version' }}
 
     strategy:
       fail-fast: false

spec/spec_helper.rb

@@ -38,7 +38,7 @@ RSpec.configure do |config|
   end
 
   # Use the GitHub Annotations formatter for CI
-  if ENV['GITHUB_ACTIONS'] == 'true'
+  if ENV['GITHUB_ACTIONS'] == 'true' && ENV['GITHUB_RSPEC'] == 'true'
     require 'rspec/github'
     config.add_formatter RSpec::Github::Formatter
   end