Complete ConfigWrapper test coverage

[hramezani]

Add coverage for:

• pydantic/pydantic/_internal/_config.py

  Line 111 in 742c391

  raise AttributeError(f'Config has no attribute {name!r}') from None

• pydantic/pydantic/_internal/_config.py

  Lines 145 to 146 in 742c391

  	c = ', '.join(f'{k}={v!r}' for k, v in self.config_dict.items())
  	return f'ConfigWrapper({c})'

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[samuelcolvin]

Is this ready to merge? If so, go ahead.