Fix linter and test failures

[samredai]

This fixes some of the linter and test failures from the recent merges.

[kbendick]

LGTM. Thanks @samredai!

[Fokko]

Thanks for fixing this @samredai! 👏🏻

I'm not seeing the C901 voilations, so I don't think we should add them:

trim trailing whitespace.................................................Passed
fix end of files.........................................................Passed
check docstring is first.................................................Passed
debug statements (python)................................................Passed
check yaml...............................................................Passed
check python ast.........................................................Passed
black....................................................................Passed
isort....................................................................Passed
mypy.....................................................................Failed
- hook id: mypy
- exit code: 1

Collecting types-requests
  Downloading types_requests-2.28.8-py3-none-any.whl (13 kB)
Collecting types-urllib3<1.27
  Downloading types_urllib3-1.26.22-py3-none-any.whl (14 kB)
Installing collected packages: types-urllib3, types-requests
Successfully installed types-requests-2.28.8 types-urllib3-1.26.22
python/tests/catalog/test_rest.py:1[60](https://github.com/apache/iceberg/runs/7849651326?check_suite_focus=true#step:5:61): error: Argument 2 to "RestCatalog" has incompatible type "Dict[<nothing>, <nothing>]"; expected "str"
python/tests/cli/test_console.py:97: error: Signature of "list_namespaces" incompatible with supertype "Catalog"
python/tests/cli/test_console.py:97: note:      Superclass:
python/tests/cli/test_console.py:97: note:          def list_namespaces(self, namespace: Union[str, Tuple[str, ...]] = ...) -> List[Tuple[str, ...]]
python/tests/cli/test_console.py:97: note:      Subclass:
python/tests/cli/test_console.py:97: note:          def list_namespaces(self) -> List[Tuple[str, ...]]
Installing missing stub packages:
/home/runner/.cache/pre-commit/repo1r7mm2an/py_env-python3.8/bin/python -m pip install types-requests


Found 2 errors in 2 files (checked 83 source files)

pycln....................................................................Passed
pyupgrade................................................................Passed
pylint...................................................................Failed
- hook id: pylint
- exit code: 4

************* Module tests.cli.test_console
python/tests/cli/test_console.py:97:4: W0221: Number of parameters was 2 in 'Catalog.list_namespaces' and is now 1 in overridden 'MockCatalog.list_namespaces' method (arguments-differ)

[Fokko]

Awesome, thanks @samredai ! 🚀