Revert "Merge branch '326106-correlation-id-to-validation-service' into 'master'"

This reverts merge request !58486

changelogs/unreleased/326106-correlation-id-to-validation-service.yml

----
-title: Add correlation id in X-Request-ID for external pipeline validation
-merge_request: 58486
-author:
-type: other

lib/gitlab/ci/pipeline/chain/validate/external.rb

@@ -69,10 +69,8 @@ module Gitlab
             end
 
             def validate_service_request
-              headers = {
-                'X-Request-ID' => Labkit::Correlation::CorrelationId.current_id,
-                'X-Gitlab-Token' => validation_service_token
-              }.compact
+              headers = {}
+              headers['X-Gitlab-Token'] = validation_service_token if validation_service_token
 
               Gitlab::HTTP.post(
                 validation_service_url, timeout: validation_service_timeout,

spec/lib/gitlab/ci/pipeline/chain/validate/external_spec.rb

@@ -127,23 +127,13 @@ RSpec.describe Gitlab::Ci::Pipeline::Chain::Validate::External do
 
       it 'passes token in X-Gitlab-Token header' do
         expect(::Gitlab::HTTP).to receive(:post) do |_url, params|
-          expect(params[:headers]).to include({ 'X-Gitlab-Token' => '123' })
+          expect(params[:headers]).to eq({ 'X-Gitlab-Token' => '123' })
         end
 
         perform!
       end
     end
 
-    it 'passes the correlation id in X-Request-ID header' do
-      allow(Labkit::Correlation::CorrelationId).to receive(:current_id).and_return('correlation-id')
-
-      expect(::Gitlab::HTTP).to receive(:post) do |_url, params|
-        expect(params[:headers]).to include({ 'X-Request-ID' => 'correlation-id' })
-      end
-
-      perform!
-    end
-
     context 'when validation returns 200 OK' do
       before do
         stub_request(:post, validation_service_url).to_return(status: 200, body: "{}")