fix: bring back type ignore for config import

[kkucharc]

Quickfix
Without #type ignore there is CI problem in pre-commit:

superset/config.py:959: error: Incompatible import of "CELERY_CONFIG" (imported name has type "Type[superset_config.CeleryConfig]", local name has type "Type[superset.config.CeleryConfig]")
superset/config.py:959: error: Incompatible import of "CeleryConfig" (imported name has type "Type[superset_config.CeleryConfig]", local name has type "Type[superset.config.CeleryConfig]")

SUMMARY

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TEST PLAN

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

[codecov-io]

Codecov Report

Merging #11333 into master will increase coverage by 0.04%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master   #11333      +/-   ##
==========================================
+ Coverage   65.66%   65.71%   +0.04%     
==========================================
  Files         835      835              
  Lines       39656    39656              
  Branches     3604     3604              
==========================================
+ Hits        26042    26061      +19     
+ Misses      13505    13486      -19     
  Partials      109      109              

Flag	Coverage Δ
#cypress	56.03% <ø> (+0.26%)	⬆️
#javascript	62.67% <ø> (ø)
#python	60.89% <0.00%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
superset/config.py	90.15% <0.00%> (ø)
superset/db_engine_specs/sqlite.py	65.62% <0.00%> (-9.38%)	⬇️
superset/utils/celery.py	82.14% <0.00%> (-3.58%)	⬇️
superset/result_set.py	96.69% <0.00%> (-1.66%)	⬇️
superset/db_engine_specs/presto.py	82.07% <0.00%> (+0.64%)	⬆️
...perset-frontend/src/views/CRUD/chart/ChartList.tsx	83.33% <0.00%> (+0.79%)	⬆️
...t-frontend/src/dashboard/actions/dashboardState.js	51.63% <0.00%> (+1.30%)	⬆️
.../src/dashboard/components/gridComponents/Chart.jsx	85.71% <0.00%> (+2.04%)	⬆️
...rontend/src/visualizations/FilterBox/FilterBox.jsx	70.37% <0.00%> (+9.87%)	⬆️
...ontend/src/dashboard/components/dnd/handleHover.js	100.00% <0.00%> (+12.50%)	⬆️

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[kkucharc]

cc: @willbarrett @mistercrunch

[villebro]

Going to merge this to get green checkmarks back on PRs (we need to sort out these linting mismatches on mypy/black)

[mistercrunch]

Thanks for fixing this. I've had some issues with tox/mypy/pyenv lately where I think mypy/tox were using the wrong version of python in some cases. This helped https://pypi.org/project/tox-pyenv/, unclear on mypy / pre-commit