Remove unused `counts_by_severity` scope

ee/app/models/vulnerability.rb

@@ -68,7 +68,6 @@ class Vulnerability < ApplicationRecord
   scope :with_severities, -> (severities) { where(severity: severities) }
   scope :with_states, -> (states) { where(state: states) }
   scope :with_scanners, -> (scanners) { joins(findings: :scanner).merge(Vulnerabilities::Scanner.with_external_id(scanners)) }
-  scope :counts_by_severity, -> { group(:severity).count }
 
   class << self
     def parent_class

ee/spec/models/vulnerability_spec.rb

@@ -166,24 +166,6 @@ RSpec.describe Vulnerability do
     end
   end
 
-  describe '.counts_by_severity' do
-    before do
-      create_list(:vulnerability, 2, severity: :critical)
-      create_list(:vulnerability, 3, severity: :high)
-      create(:vulnerability, severity: :low)
-    end
-
-    subject { described_class.counts_by_severity }
-
-    it 'returns the count for each severity' do
-      is_expected.to eq({
-        'critical' => 2,
-        'high' => 3,
-        'low' => 1
-      })
-    end
-  end
-
   describe '.counts_by_day_and_severity' do
     context 'when the vulnerability_history feature flag is disabled' do
       before do