A Mongoid::Document having associations that are marked `dependent: :destroy`

Expected behavior

• when calling delete only the record i want gets deleted

Actual behavior

• all associations are destroyed further cascading their associations to be destroyed

Example Code to reproduce:

```
class Test
include Mongoid::Document
has_many :testings, dependent: :destroy
end

class Testing
include Mongoid::Document
belongs_to :test
before_destroy do |record|
puts "delete must never call destroy that is what destroy is for!"
throw(:abort)
end
end

> test = Test.create
> test.testings << Testing.create
> test.testings.count
1
> test.delete
delete must never call destroy that is what destroy is for!

1. hackto achieve correct behavier
   class Test
   include Mongoid::Document
   has_many :testings, dependent: :destroy
   def delete
   self.class.where(id: self.id).delete_all
   end
   end
   ```

This is contrary to what ActiveRecord does and because of that there is no means of deleting a single record with having control about if you want to delete instead destroy.