Revert problematic LDAP person validation that threw exceptions

Constructors shouldn't throw exceptions. We also learned that
different LDAP servers behave a bit unexpectedly sometimes -
returning attributes we didn't ask for, or returned attributes
with language subtypes.

changelogs/unreleased/remove_ldap_person_validation.yml

+---
+title: LDAP Person no longer throws exception on invalid entry
+merge_request:
+author:
+type: fixed

lib/gitlab/ldap/person.rb

@@ -63,8 +63,6 @@ module Gitlab
         Rails.logger.debug { "Instantiating #{self.class.name} with LDIF:\n#{entry.to_ldif}" }
         @entry = entry
         @provider = provider
-
-        validate_entry
       end
 
       def name
@@ -115,19 +113,6 @@ module Gitlab
 
         entry.public_send(selected_attr) # rubocop:disable GitlabSecurity/PublicSend
       end
-
-      def validate_entry
-        allowed_attrs = self.class.ldap_attributes(config).map(&:downcase)
-
-        # Net::LDAP::Entry transforms keys to symbols. Change to strings to compare.
-        entry_attrs = entry.attribute_names.map { |n| n.to_s.downcase }
-        invalid_attrs = entry_attrs - allowed_attrs
-
-        if invalid_attrs.any?
-          raise InvalidEntryError,
-                "#{self.class.name} initialized with Net::LDAP::Entry containing invalid attributes(s): #{invalid_attrs}"
-        end
-      end
     end
   end
 end

spec/lib/gitlab/ldap/person_spec.rb

@@ -66,15 +66,6 @@ describe Gitlab::LDAP::Person do
     end
   end
 
-  describe '.validate_entry' do
-    it 'raises InvalidEntryError' do
-      entry['foo'] = 'bar'
-
-      expect { described_class.new(entry, 'ldapmain') }
-        .to raise_error(Gitlab::LDAP::Person::InvalidEntryError)
-    end
-  end
-
   describe '#name' do
     it 'uses the configured name attribute and handles values as an array' do
       name = 'John Doe'