Exec-next: remove next namespacing #3456

Job	Run time
mongodb_test (gemfiles/mongoid_8.gemfile)	2m 15s
lint	29s
mongodb_test (gemfiles/mongoid_9.gemfile)	2m 0s
system_tests	1m 26s
postgres_test (gemfiles/rails_7.2_postgresql.gemfile, 3.3)	2m 23s
javascript_test	27s
test (Gemfile, head)	1m 40s
postgres_test (gemfiles/rails_master.gemfile, 3.3, 1)	2m 30s
test (gemfiles/rails_master.gemfile, 3.4, 1, 1, 1)	2m 21s
test (gemfiles/rails_8.0.gemfile, 3.3, 1)	1m 59s
test (gemfiles/rails_8.1.gemfile, 4, 1, 1)	2m 1s
test (Gemfile, 2.7)	1m 45s
	21m 16s

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