Move name presence validation to core

Board name presence should be validated also in FOSS - this is
not EE-specific attribute.

app/models/board.rb

@@ -7,6 +7,7 @@ class Board < ApplicationRecord
   has_many :lists, -> { ordered }, dependent: :delete_all # rubocop:disable Cop/ActiveRecordDependent
   has_many :destroyable_lists, -> { destroyable.ordered }, class_name: "List"
+  validates :name, presence: true
   validates :project, presence: true, if: :project_needed?
   validates :group, presence: true, unless: :project

changelogs/unreleased/board_args_consolidation.yml

 ---
 title: Fixed error handling GraphQL API when issue board creation fails
-merge_request: 55982
+merge_request: 56467
 author:
 type: fixed

ee/app/models/ee/board.rb

@@ -24,8 +24,6 @@ module Board
       has_many :labels, through: :board_labels
-      validates :name, presence: true
-
       scope :with_associations, -> { preload(:destroyable_lists, :labels, :assignee) }
     end

ee/spec/models/board_spec.rb

@@ -18,10 +18,6 @@
     it { is_expected.to have_many(:boards_epic_user_preferences).class_name('Boards::EpicUserPreference') }
   end
-  describe 'validations' do
-    it { is_expected.to validate_presence_of(:name) }
-  end
-
   context 'validations' do
     context 'when group is present' do
       subject { described_class.new(group: create(:group)) }

spec/models/board_spec.rb

@@ -12,6 +12,7 @@
   end
   describe 'validations' do
+    it { is_expected.to validate_presence_of(:name) }
     it { is_expected.to validate_presence_of(:project) }
   end