[#64515] Remove unneeded code by singularizing phase api name

lib/api/v3/project_phase_definitions/project_phase_definition_collection_representer.rb

@@ -31,7 +31,7 @@
 module API
   module V3
     module ProjectPhaseDefinitions
-      class ProjectPhaseDefinitionsCollectionRepresenter < ::API::Decorators::OffsetPaginatedCollection
+      class ProjectPhaseDefinitionCollectionRepresenter < ::API::Decorators::OffsetPaginatedCollection
       end
     end
   end

lib/api/v3/project_phase_definitions/project_phase_definitions_api.rb

@@ -39,7 +39,7 @@ module API
 
           get &::API::V3::Utilities::Endpoints::Index
                  .new(model: Project::PhaseDefinition,
-                      api_name: "ProjectPhaseDefinitions")
+                      api_name: "ProjectPhaseDefinition")
                  .mount
 
           route_param :id do

lib/api/v3/project_phase_definitions/project_phase_definitions_representer.rb

@@ -1,38 +0,0 @@
-# frozen_string_literal: true
-
-# -- copyright
-# OpenProject is an open source project management software.
-# Copyright (C) the OpenProject GmbH
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License version 3.
-#
-# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
-# Copyright (C) 2006-2013 Jean-Philippe Lang
-# Copyright (C) 2010-2013 the ChiliProject Team
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; either version 2
-# of the License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
-#
-# See COPYRIGHT and LICENSE files for more details.
-# ++
-
-module API
-  module V3
-    module ProjectPhaseDefinitions
-      class ProjectPhaseDefinitionsRepresenter < ProjectPhaseDefinitionRepresenter
-      end
-    end
-  end
-end

lib/api/v3/project_phases/project_phase_representer.rb

@@ -61,11 +61,6 @@ module API
           "ProjectPhase"
         end
       end
-
-      # FIXME: This name is automatically generated by the ParamsToQueryService - this alias here is just a quick way
-      # to make this class discoverable. Consider fixing the ParamsToQueryService to use the correct name instead.
-      class ProjectPhasesRepresenter < ProjectPhaseRepresenter
-      end
     end
   end
 end