Add .upcase method, disable cop in registry class enum

ee/app/graphql/types/geo/registry_class_enum.rb

@@ -13,7 +13,8 @@ class RegistryClassEnum < BaseEnum
       ::Geo::Secondary::RegistryConsistencyWorker::REGISTRY_CLASSES.each do |registry_class|
         next unless registry_class.graphql_mutable?
 
-        value registry_class.graphql_enum_key.upcase,
+        # Disabling RuboCop: `graphql_enum_key` adheres to the uppercase rule of Graphql/EnumValues.
+        value registry_class.graphql_enum_key, # rubocop:disable Graphql/EnumValues
           value: registry_class.to_s,
           description: "#{registry_class} registry class"
       end

ee/app/models/geo/base_registry.rb

@@ -93,7 +93,7 @@ def self.graphql_mutable?
 
   # Method to generate a GraphQL enum key based on registry class.
   def self.graphql_enum_key
-    self.to_s.gsub('Geo::', '').underscore
+    self.to_s.gsub('Geo::', '').underscore.upcase
   end
 
   # Search for a list of records associated with registries,

ee/lib/gitlab/geo/replicator.rb

@@ -96,8 +96,8 @@ def self.graphql_field_name
 
       # @return [String] GraphQL mutation registry class used by registry_class_enum.rb. E.g. "PACKAGE_FILE_REGISTRY"
       def self.graphql_mutation_registry_class
-        self.registry_class.graphql_enum_key.upcase
-      end      
+        self.registry_class.graphql_enum_key
+      end
 
       # Return the registry related to the replicable resource
       #

ee/spec/requests/api/graphql/mutations/geo/registries/update_spec.rb

@@ -15,7 +15,7 @@
 
   with_them do
     let(:registry) { create(registry_factory) }  # rubocop:disable Rails/SaveBang
-    let(:registry_class_argument) { registry_class.graphql_enum_key.upcase }
+    let(:registry_class_argument) { registry_class.graphql_enum_key }
     let(:registry_model_primary_key) { registry_class::MODEL_FOREIGN_KEY.to_s.camelize(:lower) }
     let(:registry_fragment_name) { registry_class_argument.downcase.camelize }
     let(:registry_global_id) { registry.to_global_id.to_s }