Fix ProtectedEnvironments::SearchService in dev

Without this fix ::BaseService get's loaded instead of
proper ProtectedEnvironments::BaseService, and I gen an error:

undefined method `project_container?' for

ee/app/services/protected_environments/search_service.rb, line 8
----------------------------------------------------------------

``` ruby
    3     class SearchService < BaseService
    4       # Returns unprotected environments filtered by name
    5       # Limited to 20 per performance reasons
    6       # rubocop: disable CodeReuse/ActiveRecord
    7       def execute(name)
>   8         raise NotImplementedError unless project_container?
    9
   10         container
   11           .environments
   12           .where.not(name: container.protected_environments.select(:name))
   13           .where('environments.name LIKE ?', "#{name}%")
```

This only happens in dev environment

ee/app/services/protected_environments/search_service.rb

 # frozen_string_literal: true
 module ProtectedEnvironments
-  class SearchService < BaseService
+  class SearchService < ::ProtectedEnvironments::BaseService
     # Returns unprotected environments filtered by name
     # Limited to 20 per performance reasons
     # rubocop: disable CodeReuse/ActiveRecord