Merge branch '210536-move-gitlab-alert-embed-service-to-core' into 'master'

Move `GitlabAlertEmbedService` from EE to CE

Closes #210536

See merge request gitlab-org/gitlab!27440

ee/lib/ee/gitlab/metrics/dashboard/service_selector.rb

@@ -9,8 +9,7 @@ module EE
 
           EE_SERVICES = [
             ::Metrics::Dashboard::ClusterMetricsEmbedService,
-            ::Metrics::Dashboard::ClusterDashboardService,
-            ::Metrics::Dashboard::GitlabAlertEmbedService
+            ::Metrics::Dashboard::ClusterDashboardService
           ].freeze
 
           class_methods do

lib/gitlab/metrics/dashboard/service_selector.rb

@@ -13,6 +13,7 @@ module Gitlab
           include Gitlab::Utils::StrongMemoize
 
           SERVICES = [
+            ::Metrics::Dashboard::GitlabAlertEmbedService,
             ::Metrics::Dashboard::CustomMetricEmbedService,
             ::Metrics::Dashboard::GrafanaMetricEmbedService,
             ::Metrics::Dashboard::DynamicEmbedService,