Rename Ci::Commit to Ci::Pipeline and rename some of the ci_commit to pipeline

app/controllers/projects/builds_controller.rb

app/controllers/projects/commit_controller.rb

app/controllers/projects/merge_requests_controller.rb

app/controllers/projects/pipelines_controller.rb

app/models/ci/build.rb

app/models/ci/pipeline.rb

app/models/ci/trigger_request.rb

app/models/commit.rb

app/models/commit_status.rb

app/models/merge_request.rb

app/models/project.rb

app/services/ci/create_pipeline_service.rb

app/services/ci/create_trigger_request_service.rb

app/services/ci/image_for_build_service.rb

app/services/create_commit_builds_service.rb

app/services/merge_requests/base_service.rb

features/steps/project/commits/commits.rb

lib/api/commit_statuses.rb

lib/api/merge_requests.rb

lib/ci/charts.rb