Remove unused ErrorHelper #2599

Job	Run time
system_tests	2m 15s
test (Gemfile, 3.2)	1m 39s
javascript_test	26s
lint	39s
test (Gemfile, 2.7)	1m 47s
test (gemfiles/rails_7.0.gemfile, 3.1)	2m 14s
mongodb_test (gemfiles/mongoid_6.gemfile)	1m 58s
postgres_test (gemfiles/rails_master.gemfile, 3.3, 1)	2m 6s
test (gemfiles/rails_master.gemfile, 3.2)	2m 40s
mongodb_test (gemfiles/mongoid_7.gemfile)	2m 0s
postgres_test (gemfiles/rails_7.1_postgresql.gemfile, 3.3)	1m 48s
test (gemfiles/rails_7.0.gemfile, 3.2)	2m 15s
test (gemfiles/rails_7.1.gemfile, 3.3)	2m 11s
test (gemfiles/rails_master.gemfile, 3.3, 1)	2m 27s
test (gemfiles/rails_master.gemfile, 3.3, 1, 1)	2m 16s
	28m 41s

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