This cop detects exits from transaction blocks to prevent this
deprecation warning:

  DEPRECATION WARNING: Using `return`, `break` or `throw` to exit a
  transaction block is
  deprecated without replacement. If the `throw` came from
  `Timeout.timeout(duration)`, pass an exception class as a second
  argument so it doesn't use `throw` to abort its block. This results
  in the transaction being committed, but in the next release of Rails

Fix all offenses and all instances missed by this cop.