Revert cross_project_pipeline source to pipeline

app/models/ci/pipeline_enums.rb

@@ -23,7 +23,9 @@ module Ci
         schedule: 4,
         api: 5,
         external: 6,
-        cross_project_pipeline: 7,
+        # TODO: Rename `pipeline` to `cross_project_pipeline` in 13.0
+        # https://gitlab.com/gitlab-org/gitlab/issues/195991
+        pipeline: 7,
         chat: 8,
         merge_request_event: 10,
         external_pull_request_event: 11,

app/services/ci/pipeline_trigger_service.rb

@@ -44,7 +44,7 @@ module Ci
       return error("400 Job has to be running", 400) unless job.running?
 
       pipeline = Ci::CreatePipelineService.new(project, job.user, ref: params[:ref])
-        .execute(:cross_project_pipeline, ignore_skip_ci: true) do |pipeline|
+        .execute(:pipeline, ignore_skip_ci: true) do |pipeline|
           source = job.sourced_pipelines.build(
             source_pipeline: job.pipeline,
             source_project: job.project,

changelogs/unreleased/create-downstream-pipeline-in-same-project.yml

 ---
 title: Allow an upstream pipeline to create a downstream pipeline in the same project
-merge_request: 20930
+merge_request: 22663
 author:
 type: added

ee/app/models/ee/ci/bridge.rb

@@ -180,7 +180,7 @@ module EE
       def cross_project_params
         {
           project: downstream_project,
-          source: :cross_project_pipeline,
+          source: :pipeline,
           target_revision: {
             ref: target_ref || downstream_project.default_branch
           },

ee/spec/requests/api/triggers_spec.rb

@@ -60,7 +60,7 @@ describe API::Triggers do
             expect { subject }.to change(Ci::Pipeline, :count)
 
             expect(response).to have_http_status(201)
-            expect(Ci::Pipeline.last.source).to eq('cross_project_pipeline')
+            expect(Ci::Pipeline.last.source).to eq('pipeline')
             expect(Ci::Pipeline.last.triggered_by_pipeline).not_to be_nil
             expect(Ci::Sources::Pipeline.last).to have_attributes(
               pipeline_id: (a_value > 0),
@@ -94,7 +94,7 @@ describe API::Triggers do
                                 .and change(Ci::PipelineVariable, :count)
 
               expect(response).to have_http_status(201)
-              expect(Ci::Pipeline.last.source).to eq('cross_project_pipeline')
+              expect(Ci::Pipeline.last.source).to eq('pipeline')
               expect(Ci::Pipeline.last.triggered_by_pipeline).not_to be_nil
               expect(Ci::Pipeline.last.variables.map { |v| { v.key => v.value } }.last).to eq(params[:variables])
             end