Add a Rails::Engine-based dashboard with trace viewer #2762

Job	Run time
lint	18s
javascript_test	27s
mongodb_test (gemfiles/mongoid_6.gemfile)	1m 46s
postgres_test (gemfiles/rails_master.gemfile, 3.3, 1)	1m 55s
mongodb_test (gemfiles/mongoid_7.gemfile)	1m 45s
system_tests	35s
postgres_test (gemfiles/rails_7.1_postgresql.gemfile, 3.3)	2m 12s
test (Gemfile, 3.4)	1m 44s
test (Gemfile, 2.7)	1m 42s
test (gemfiles/rails_7.0.gemfile, 3.1)	2m 14s
test (gemfiles/rails_7.0.gemfile, 3.2)	2m 21s
test (gemfiles/rails_7.1.gemfile, 3.3)	2m 18s
test (gemfiles/rails_master.gemfile, 3.3, 1, 1, 1)	2m 28s
test (gemfiles/rails_master.gemfile, 3.4, 1, 1, 1)	2m 37s
	24m 22s

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