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fuzz: use format_object instead of space:format()

Currently, engine fuzzer calls `space:format()` to obtain space format.
When this call happens, it can raise an error because of transaction
conflict or fiber slice, because this function reads from space `_space`
under the hood. The problem is it's called when generating arguments for
an operation, and this function is not expected to fail. As the result,
worker fibers stop due to unhandled raised error. Let's use
`format_object` instead, it cannot raise an error since it doesn't read
any data from spaces, so the worker fibers won't stop until timeout.

Also, such approach is more correct because during format alter this
field has an actual format.

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