Add snippets_size to Group entity

changelogs/unreleased/fj-224657-include-snippets-size-in-group-statistics.yml

+---
+title: Add snippets_size to Group entity
+merge_request: 35585
+author:
+type: changed

doc/api/groups.md

@@ -94,7 +94,8 @@ GET /groups?statistics=true
       "wiki_size" : 100,
       "lfs_objects_size" : 123,
       "job_artifacts_size" : 57,
-      "packages_size": 0
+      "packages_size": 0,
+      "snippets_size" : 50,
     }
   }
 ]

lib/api/entities/group.rb

@@ -31,6 +31,7 @@ module API
           expose :wiki_size
           expose :lfs_objects_size
           expose :build_artifacts_size, as: :job_artifacts_size
+          expose :snippets_size
         end
       end
     end

spec/requests/api/groups_spec.rb

@@ -184,11 +184,12 @@ RSpec.describe API::Groups do
 
       it "includes statistics if requested" do
         attributes = {
-          storage_size: 1158,
+          storage_size: 2392,
           repository_size: 123,
           wiki_size: 456,
           lfs_objects_size: 234,
-          build_artifacts_size: 345
+          build_artifacts_size: 345,
+          snippets_size: 1234
         }.stringify_keys
         exposed_attributes = attributes.dup
         exposed_attributes['job_artifacts_size'] = exposed_attributes.delete('build_artifacts_size')