Work around bugs with open world type optimizations (#5367)

Since #5347 public types are never updated by type optimizations, but the
optimization passes have not yet been updated to take that into account, so they
are all buggy under an open world assumption. In #5359 we worked around many
closed world validation errors in the fuzzer by treating --closed-world like a
feature flag and checking whether it was necessary for fuzzer input, but that
did not prevent the type optimization passes from running under an open world,
so it did not work around all the potential issues.

Work around the problem more thoroughly by not running any type optimization
passes in the fuzzer without --closed-world. Also add logic to those passes to
error out if they are run without --closed-world and update the tests
accordingly.

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