Fix constant lookup issue for `Vulnerabilities::BaseService`

ee/app/services/vulnerabilities/confirm_service.rb

 # frozen_string_literal: true
 
+require_dependency 'vulnerabilities/base_service'
+
 module Vulnerabilities
   class ConfirmService < BaseService
-    include Gitlab::Allowable
-
     def execute
       raise Gitlab::Access::AccessDeniedError unless authorized?
 

ee/app/services/vulnerabilities/dismiss_service.rb

 # frozen_string_literal: true
 
+require_dependency 'vulnerabilities/base_service'
+
 module Vulnerabilities
   class DismissService < BaseService
-    include Gitlab::Allowable
-
     FindingsDismissResult = Struct.new(:ok?, :finding, :message)
 
     def initialize(current_user, vulnerability, comment = nil)

ee/app/services/vulnerabilities/resolve_service.rb

 # frozen_string_literal: true
 
+require_dependency 'vulnerabilities/base_service'
+
 module Vulnerabilities
   class ResolveService < BaseService
     def execute

ee/app/services/vulnerabilities/revert_to_detected_service.rb

 # frozen_string_literal: true
 
+require_dependency 'vulnerabilities/base_service'
+
 module Vulnerabilities
   class RevertToDetectedService < BaseService
-    include Gitlab::Allowable
-
     REVERT_PARAMS = { resolved_by: nil, resolved_at: nil, dismissed_by: nil, dismissed_at: nil, confirmed_by: nil, confirmed_at: nil }.freeze
 
     def execute