Support Relay persisted queries in ActionCable handler #1818

Job	Run time
lint	32s
test (Gemfile, 3.1)	42s
javascript_test	59s
test (gemfiles/rails_5.2.gemfile, 2.7)	58s
mongodb_test (gemfiles/mongoid_6.gemfile)	1m 2s
postgres_test	1m 20s
test (gemfiles/rails_7.0.gemfile, 3.1)	57s
mongodb_test (gemfiles/mongoid_7.gemfile)	58s
test (gemfiles/rails_master.gemfile, 3.1)	1m 14s
system_tests	52s
test (gemfiles/rails_7.0.gemfile, 3.2)	50s
test (gemfiles/rails_master.gemfile, 3.2)	1m 18s
	11m 42s

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