Add Sentry tracing #1929

Job	Run time
postgres_test	2m 7s
lint	1m 8s
mongodb_test (gemfiles/mongoid_6.gemfile)	1m 32s
javascript_test	3m 10s
mongodb_test (gemfiles/mongoid_7.gemfile)	1m 27s
system_tests	1m 42s
test (Gemfile, 3.2)	1m 5s
test (gemfiles/rails_7.0.gemfile, 3.1)	1m 21s
test (gemfiles/rails_master.gemfile, 3.1)	1m 56s
test (gemfiles/rails_7.0.gemfile, 3.2)	1m 19s
test (gemfiles/rails_7.1.gemfile, 3.3)	1m 31s
test (gemfiles/rails_master.gemfile, 3.3)	1m 48s
	20m 6s

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