Add test case for ActiveRecord::Base.record_timestamps = false
Add test case for ActiveRecord::Base.record_timestamps = false

This is a failing test case for Lighthouse ticket #5440:

  https://rails.lighthouseapp.com/projects/8994/tickets/5440

Signed-off-by: José Valim <0c2436ea76ed86e37cc05f66dea18d48ef390882@gmail.com>

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