Re-enable pylint on some configuration files

[willbarrett]

CATEGORY

Choose one

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

SUMMARY

Re-enable pylint on some configuration-related files.

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 @mistercrunch

[codecov-io]

Codecov Report

Merging #8767 into master will decrease coverage by 6.23%.
The diff coverage is 75%.

@@            Coverage Diff             @@
##           master    #8767      +/-   ##
==========================================
- Coverage   72.07%   65.84%   -6.24%     
==========================================
  Files         123      482     +359     
  Lines       12844    24157   +11313     
  Branches        0     2770    +2770     
==========================================
+ Hits         9257    15905    +6648     
- Misses       3587     8074    +4487     
- Partials        0      178     +178

Impacted Files	Coverage Δ
superset/legacy.py	100% <ø> (ø)	⬆️
superset/migrations/env.py	0% <0%> (ø)	⬆️
superset/forms.py	95.45% <100%> (+0.45%)	⬆️
superset/stats_logger.py	74.41% <66.66%> (ø)	⬆️
superset/config.py	89.95% <77.77%> (ø)	⬆️
superset/assets/src/components/Checkbox.jsx	100% <0%> (ø)
.../assets/src/dashboard/reducers/dashboardFilters.js	88.46% <0%> (ø)
...ets/src/dashboard/components/dnd/DragDroppable.jsx	94.59% <0%> (ø)
superset/assets/src/components/EditableTitle.jsx	80.28% <0%> (ø)
...src/explore/components/controls/VizTypeControl.jsx	76.92% <0%> (ø)
... and 354 more

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