Use target_project for the feature flag

app/finders/ci/pipelines_for_merge_request_finder.rb

@@ -82,7 +82,7 @@ module Ci
     end
 
     def all_pipelines_for_merge_request
-      if Feature.enabled?(:decomposed_ci_query_in_pipelines_for_merge_request_finder, source_project, default_enabled: :yaml)
+      if Feature.enabled?(:decomposed_ci_query_in_pipelines_for_merge_request_finder, target_project, default_enabled: :yaml)
         pipelines_for_merge_request = triggered_by_merge_request
         pipelines_for_branch = triggered_for_branch.for_sha(recent_diff_head_shas(COMMITS_LIMIT))
 

spec/finders/ci/pipelines_for_merge_request_finder_spec.rb

@@ -242,7 +242,7 @@ RSpec.describe Ci::PipelinesForMergeRequestFinder do
 
       context 'when `decomposed_ci_query_in_pipelines_for_merge_request_finder` feature flag enabled' do
         before do
-          stub_feature_flags(decomposed_ci_query_in_pipelines_for_merge_request_finder: merge_request.source_project)
+          stub_feature_flags(decomposed_ci_query_in_pipelines_for_merge_request_finder: merge_request.target_project)
         end
 
         it_behaves_like 'returns all pipelines for merge request'