Fix recursion error upon assersion error

[nabenabe0928]

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When we input an invalid set of arguments to the bbob family, we get the recursion error like this:

bbob function_id must be in [1, 24]
Exception ignored in: <function Problem.__del__ at 0x7fd73e0ddd00>
Traceback (most recent call last):
  File "/home/shuhei/pfn-work/optuna-dev/optunahub-registry/./package/benchmarks/bbob/_bbob.py", line 107, in __del__
    self._problem.free()
    ^^^^^^^^^^^^^
  File "/home/shuhei/pfn-work/optuna-dev/optunahub-registry/./package/benchmarks/bbob/_bbob.py", line 101, in __getattr__
    return getattr(self._problem, name)
                   ^^^^^^^^^^^^^
  File "/home/shuhei/pfn-work/optuna-dev/optunahub-registry/./package/benchmarks/bbob/_bbob.py", line 101, in __getattr__
    return getattr(self._problem, name)
                   ^^^^^^^^^^^^^
  File "/home/shuhei/pfn-work/optuna-dev/optunahub-registry/./package/benchmarks/bbob/_bbob.py", line 101, in __getattr__
    return getattr(self._problem, name)
                   ^^^^^^^^^^^^^
  [Previous line repeated 995 more times]
RecursionError: maximum recursion depth exceeded

However, this is not really friendly and can be confusing as well.
This PR aims to resolve this issue.
Here is a simple code to verify the new version:

import optuna
import optunahub


names = [
    "bbob", "bbob_biobj", "bbob_biobj_mixint", "bbob_constrained", "bbob_largescale", "bbob_mixint", "bbob_noisy"
]
for name in names:
    try:
        problem = optunahub.load_local_module(f"benchmarks/{name}", registry_root="./package").Problem(
            function_id=0, dimension=2, instance_id=1
        )
    except Exception as e:
        print(name, e)

[y0z]

LGTM

[y0z]

I've confirmed the change works.