Refactor unnecessary shared tests

This commit refactors the shared tests in pipeline processeing
service.

spec/services/ci/pipeline_processing/shared_processing_service_tests_with_yaml.rb

-# frozen_string_literal: true
-
-RSpec.shared_context 'Pipeline Processing Service Tests With Yaml' do
-  let_it_be(:project) { create(:project, :repository) }
-  let_it_be(:user)    { project.owner }
-
-  where(:test_file_path) do
-    Dir.glob(Rails.root.join('spec/services/ci/pipeline_processing/test_cases/*.yml'))
-  end
-
-  with_them do
-    let(:test_file) { YAML.load_file(test_file_path) }
-    let(:pipeline) { Ci::CreatePipelineService.new(project, user, ref: 'master').execute(:pipeline).payload }
-
-    before do
-      stub_ci_pipeline_yaml_file(YAML.dump(test_file['config']))
-    end
-
-    it 'follows transitions' do
-      expect(pipeline).to be_persisted
-      Sidekiq::Worker.drain_all # ensure that all async jobs are executed
-      check_expectation(test_file.dig('init', 'expect'), "init")
-
-      test_file['transitions'].each_with_index do |transition, idx|
-        event_on_jobs(transition['event'], transition['jobs'])
-        Sidekiq::Worker.drain_all # ensure that all async jobs are executed
-        check_expectation(transition['expect'], "transition:#{idx}")
-      end
-    end
-
-    private
-
-    def check_expectation(expectation, message)
-      expect(current_state.deep_stringify_keys).to eq(expectation), message
-    end
-
-    def current_state
-      # reload pipeline and all relations
-      pipeline.reload
-
-      {
-        pipeline: pipeline.status,
-        stages: pipeline.stages.pluck(:name, :status).to_h,
-        jobs: pipeline.latest_statuses.pluck(:name, :status).to_h
-      }
-    end
-
-    def event_on_jobs(event, job_names)
-      statuses = pipeline.latest_statuses.by_name(job_names).to_a
-      expect(statuses.count).to eq(job_names.count) # ensure that we have the same counts
-
-      statuses.each do |status|
-        if event == 'play'
-          status.play(user)
-        else
-          status.public_send("#{event}!")
-        end
-      end
-    end
-  end
-end