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lua: prevent serialization of error for ucdata

Without checking the return value of `lua_pcall()` in
`lua_field_inspect_ucdata()`, the error message itself is returned as a
serialized result. The result status of `lua_pcall()` is not ignored
now.

NO_DOC=bugfix

Closes #9396

(cherry picked from commit 98474f701)

Since the behavior of the <app/fiber.lua> test is changed in 2.11 the
result file is updated here.

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