Rename method to `#cost_factor_enabled?`

As suggested in https://gitlab.com/gitlab-org/gitlab/-/issues/336021,
`#cost_factor_enabled?` is a more accurate name for
`Ci::Build#shared_runners_minutes_limit_enabled?`

ee/app/models/ee/ci/build.rb

@@ -67,7 +67,7 @@ module EE
         end
       end
 
-      def shared_runners_minutes_limit_enabled?
+      def cost_factor_enabled?
         runner&.cost_factor_enabled?(project)
       end
 

ee/app/services/ci/minutes/track_live_consumption_service.rb

@@ -77,8 +77,8 @@ module Ci
           ServiceResponse.error(message: 'Feature not enabled')
         elsif !build.running?
           ServiceResponse.error(message: 'Build is not running')
-        elsif !build.shared_runners_minutes_limit_enabled?
-          ServiceResponse.error(message: 'CI minutes limit not enabled for build')
+        elsif !build.cost_factor_enabled?
+          ServiceResponse.error(message: 'Cost factor not enabled for build')
         else
           ServiceResponse.success
         end

ee/app/services/ci/minutes/update_build_minutes_service.rb

@@ -6,7 +6,7 @@ module Ci
       # Calculates consumption and updates the project and namespace statistics(legacy)
       # or ProjectMonthlyUsage and NamespaceMonthlyUsage(not legacy) based on the passed build.
       def execute(build)
-        return unless build.shared_runners_minutes_limit_enabled?
+        return unless build.cost_factor_enabled?
         return unless build.complete?
         return unless build.duration&.positive?
 

ee/spec/models/ci/build_spec.rb

@@ -48,8 +48,8 @@ RSpec.describe Ci::Build do
     it { is_expected.to have_one(:dast_scanner_profile).class_name('DastScannerProfile').through(:dast_scanner_profiles_build) }
   end
 
-  describe '#shared_runners_minutes_limit_enabled?' do
-    subject { job.shared_runners_minutes_limit_enabled? }
+  describe '#cost_factor_enabled?' do
+    subject { job.cost_factor_enabled? }
 
     context 'for shared runner' do
       before do

ee/spec/services/ci/minutes/track_live_consumption_service_spec.rb

@@ -69,15 +69,15 @@ RSpec.describe Ci::Minutes::TrackLiveConsumptionService do
     context 'when runner is not of instance type' do
       let(:runner) { create(:ci_runner, :project) }
 
-      it_behaves_like 'returns early', 'CI minutes limit not enabled for build'
+      it_behaves_like 'returns early', 'Cost factor not enabled for build'
     end
 
-    context 'when shared runners limit is not enabled for build' do
+    context 'when cost factor is not enabled for build' do
       before do
-        allow(build).to receive(:shared_runners_minutes_limit_enabled?).and_return(false)
+        allow(build).to receive(:cost_factor_enabled?).and_return(false)
       end
 
-      it_behaves_like 'returns early', 'CI minutes limit not enabled for build'
+      it_behaves_like 'returns early', 'Cost factor not enabled for build'
     end
 
     context 'when build has not been tracked recently' do