Make CI minutes consumption increment idempotently

Removing feature flag and making `build_id` param as
mandatory for the service object.

Changelog: fixed
EE: true

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

@@ -7,7 +7,7 @@ module Ci
 
       IDEMPOTENCY_CACHE_TTL = 12.hours
 
-      def initialize(project_id, namespace_id, build_id = nil)
+      def initialize(project_id, namespace_id, build_id)
         @project_id = project_id
         @namespace_id = namespace_id
         @build_id = build_id
@@ -19,14 +19,7 @@ module Ci
       def execute(consumption)
         legacy_track_usage_of_monthly_minutes(consumption)
 
-        # TODO: fix this condition after the next deployment when `build_id`
-        # is made a mandatory argument.
-        # https://gitlab.com/gitlab-org/gitlab/-/issues/331785
-        if @build_id && idempotent_consumption_enabled?
-          ensure_idempotency { track_usage_of_monthly_minutes(consumption) }
-        else
-          track_usage_of_monthly_minutes(consumption)
-        end
+        ensure_idempotency { track_usage_of_monthly_minutes(consumption) }
 
         send_minutes_email_notification
       end
@@ -124,15 +117,6 @@ module Ci
           redis.exists(idempotency_cache_key)
         end
       end
-
-      # When running this worker the project might have been deleted.
-      # In this case we consider the feature flag disabled for backward
-      # compatibility.
-      def idempotent_consumption_enabled?
-        return false unless @project
-
-        Feature.enabled?(:idempotent_ci_minutes_consumption, @project, default_enabled: :yaml)
-      end
     end
   end
 end

ee/config/feature_flags/development/idempotent_ci_minutes_consumption.yml

----
-name: idempotent_ci_minutes_consumption
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/69994
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/340517
-milestone: '14.4'
-type: development
-group: group::pipeline execution
-default_enabled: false

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

@@ -127,10 +127,8 @@ RSpec.describe Ci::Minutes::UpdateProjectAndNamespaceUsageService do
       it 'does not create nested transactions', :delete do
         expect(ApplicationRecord.connection.transaction_open?).to be false
 
-        service = described_class.new(project.id, namespace.id)
-
         queries = ActiveRecord::QueryRecorder.new do
-          service
+          subject
         end
 
         savepoints = queries.occurrences.keys.flatten.select do |query|
@@ -178,20 +176,6 @@ RSpec.describe Ci::Minutes::UpdateProjectAndNamespaceUsageService do
 
             subject
           end
-
-          context 'when feature flag idempotent_ci_minutes_consumption is disabled' do
-            before do
-              stub_feature_flags(idempotent_ci_minutes_consumption: false)
-            end
-
-            it_behaves_like 'updates monthly consumption'
-          end
-
-          context 'when build_id is not provided as parameter' do
-            let(:service) { described_class.new(project.id, namespace.id) }
-
-            it_behaves_like 'updates monthly consumption' # not idempotent / temporary backwards compatibility
-          end
         end
       end
     end