Simplify GraphQL::Backtrace #2701

Job	Run time
system_tests	2m 3s
javascript_test	30s
test (Gemfile, 3.4)	2m 57s
lint	1m 27s
test (Gemfile, 2.7)	3m 15s
mongodb_test (gemfiles/mongoid_6.gemfile)	3m 12s
test (gemfiles/rails_7.0.gemfile, 3.1)	3m 25s
postgres_test (gemfiles/rails_master.gemfile, 3.3, 1)	3m 21s
mongodb_test (gemfiles/mongoid_7.gemfile)	3m 18s
test (gemfiles/rails_master.gemfile, 3.2)	4m 2s
postgres_test (gemfiles/rails_7.1_postgresql.gemfile, 3.3)	3m 9s
test (gemfiles/rails_7.0.gemfile, 3.2)	3m 44s
test (gemfiles/rails_7.1.gemfile, 3.3)	3m 38s
test (gemfiles/rails_master.gemfile, 3.3, 1, 1)	4m 6s
test (gemfiles/rails_master.gemfile, 3.4, 1, 1)	3m 38s
	45m 45s

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