Add a Rails::Engine-based dashboard with trace viewer #2758

Job	Run time
system_tests	28s
system_tests	28s
lint	18s
lint	18s
javascript_test	27s
javascript_test	27s
postgres_test (gemfiles/rails_master.gemfile, 3.3, 1)	2m 2s
postgres_test (gemfiles/rails_master.gemfile, 3.3, 1)	2m 2s
mongodb_test (gemfiles/mongoid_6.gemfile)	1m 47s
mongodb_test (gemfiles/mongoid_6.gemfile)	1m 47s
postgres_test (gemfiles/rails_7.1_postgresql.gemfile, 3.3)	2m 12s
postgres_test (gemfiles/rails_7.1_postgresql.gemfile, 3.3)	2m 12s
mongodb_test (gemfiles/mongoid_7.gemfile)	1m 43s
mongodb_test (gemfiles/mongoid_7.gemfile)	1m 43s
test (Gemfile, 3.4)	2m 3s
test (Gemfile, 3.4)	2m 3s
test (Gemfile, 2.7)	1m 45s
test (Gemfile, 2.7)	1m 45s
test (gemfiles/rails_7.0.gemfile, 3.1)	2m 22s
test (gemfiles/rails_7.0.gemfile, 3.1)	2m 22s
test (gemfiles/rails_master.gemfile, 3.2)	2m 45s
test (gemfiles/rails_master.gemfile, 3.2)	2m 45s
test (gemfiles/rails_7.0.gemfile, 3.2)	2m 15s
test (gemfiles/rails_7.0.gemfile, 3.2)	2m 15s
test (gemfiles/rails_7.1.gemfile, 3.3)	2m 36s
test (gemfiles/rails_7.1.gemfile, 3.3)	2m 36s
test (gemfiles/rails_master.gemfile, 3.3, 1, 1)	2m 55s
test (gemfiles/rails_master.gemfile, 3.3, 1, 1)	2m 55s
test (gemfiles/rails_master.gemfile, 3.4, 1, 1, 1)	2m 29s
test (gemfiles/rails_master.gemfile, 3.4, 1, 1, 1)	2m 29s
	56m 14s

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