Migrate internal runtime state to Fiber storage #2609

Job	Run time
javascript_test	27s
lint	18s
mongodb_test (gemfiles/mongoid_6.gemfile)	1m 26s
system_tests	1m 38s
postgres_test (gemfiles/rails_master.gemfile, 3.3, 1)	1m 43s
mongodb_test (gemfiles/mongoid_7.gemfile)	1m 28s
test (Gemfile, 3.2)	1m 25s
test (Gemfile, 2.7)	1m 16s
postgres_test (gemfiles/rails_7.1_postgresql.gemfile, 3.3)	1m 51s
test (gemfiles/rails_7.0.gemfile, 3.1)	1m 46s
test (gemfiles/rails_master.gemfile, 3.2)	1m 52s
test (gemfiles/rails_7.0.gemfile, 3.2)	1m 35s
test (gemfiles/rails_7.1.gemfile, 3.3)	1m 43s
test (gemfiles/rails_master.gemfile, 3.3, 1)	1m 59s
test (gemfiles/rails_master.gemfile, 3.3, 1, 1)	1m 57s
	22m 24s

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