Remove unused Vulnerability::Finding.for_pipelines_with_sha

Usages for this scope appear to have been removed in
https://gitlab.com/gitlab-org/gitlab/-/commit/44a31d8bd8991f94c12dce3a6b695c7c38cc3a52 .

This method is cross-joining between `ci_*` and non `ci_*` tables and as
such it will not be possible when `ci_*` tables are moved to a separate
database.

ee/app/models/vulnerabilities/finding.rb

@@ -95,12 +95,6 @@ module Vulnerabilities
     scope :scoped_project, -> { where('vulnerability_occurrences.project_id = projects.id') }
     scope :eager_load_vulnerability_flags, -> { includes(:vulnerability_flags) }
 
-    def self.for_pipelines_with_sha(pipelines)
-      joins(:pipelines)
-        .where(ci_pipelines: { id: pipelines })
-        .select("vulnerability_occurrences.*, ci_pipelines.sha")
-    end
-
     def self.for_pipelines(pipelines)
       joins(:finding_pipelines)
         .where(vulnerability_occurrence_pipelines: { pipeline_id: pipelines })

ee/spec/models/vulnerabilities/finding_spec.rb

@@ -129,21 +129,6 @@ RSpec.describe Vulnerabilities::Finding do
       end
     end
 
-    describe '.for_pipelines_with_sha' do
-      let(:project) { create(:project) }
-      let(:pipeline) { create(:ci_pipeline, :success, project: project) }
-
-      before do
-        create(:vulnerabilities_finding, pipelines: [pipeline], project: project)
-      end
-
-      subject(:findings) { described_class.for_pipelines_with_sha([pipeline]) }
-
-      it 'sets the sha' do
-        expect(findings.first.sha).to eq(pipeline.sha)
-      end
-    end
-
     describe '.by_report_types' do
       let!(:vulnerability_sast) { create(:vulnerabilities_finding, report_type: :sast) }
       let!(:vulnerability_secret_detection) { create(:vulnerabilities_finding, report_type: :secret_detection) }