Re-enable Pylint on some celery-related files

[willbarrett]

CATEGORY

Choose one

• Bug Fix
• Enhancement (new features, refinement)
• Refactor
• Add tests
• Build / Development Environment
• Documentation

SUMMARY

Re-enables pylint for a couple of files related to Celery.

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

REVIEWERS

@john-bodley @dpgaspar

[codecov-io]

Codecov Report

Merging #8765 into master will not change coverage.
The diff coverage is 50%.

@@           Coverage Diff           @@
##           master    #8765   +/-   ##
=======================================
  Coverage   65.83%   65.83%           
=======================================
  Files         482      482           
  Lines       24155    24155           
  Branches     2770     2770           
=======================================
  Hits        15903    15903           
  Misses       8074     8074           
  Partials      178      178

Impacted Files	Coverage Δ
superset/tasks/celery_app.py	0% <ø> (ø)	⬆️
superset/tasks/schedules.py	79.89% <50%> (ø)	⬆️

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