Remove Ci::Pipeline#latest_for_shas cause it's not used

app/models/ci/pipeline.rb

@@ -299,11 +299,6 @@ module Ci
       end
     end
 
-    def self.latest_for_shas(shas)
-      max_id_per_sha = for_sha(shas).group(:sha).select("max(id)")
-      where(id: max_id_per_sha)
-    end
-
     def self.latest_successful_ids_per_project
       success.group(:project_id).select('max(id) as id')
     end

spec/models/ci/pipeline_spec.rb

@@ -1768,17 +1768,6 @@ describe Ci::Pipeline, :mailer do
     end
   end
 
-  describe '.latest_for_shas' do
-    let(:sha) { 'abc' }
-
-    it 'returns latest pipeline for sha' do
-      create(:ci_pipeline, sha: sha)
-      pipeline2 = create(:ci_pipeline, sha: sha)
-
-      expect(described_class.latest_for_shas(sha)).to contain_exactly(pipeline2)
-    end
-  end
-
   describe '.latest_successful_ids_per_project' do
     let(:projects) { create_list(:project, 2) }
     let!(:pipeline1) { create(:ci_pipeline, :success, project: projects[0]) }