Re-enable pylint for some model files

[willbarrett]

CATEGORY

Choose one

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

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

REVIEWERS

@john-bodley @dpgaspar @mistercrunch

[codecov-io]

Codecov Report

Merging #8770 into master will decrease coverage by 6.16%.
The diff coverage is 71.29%.

@@            Coverage Diff            @@
##           master   #8770      +/-   ##
=========================================
- Coverage   72.07%   65.9%   -6.17%     
=========================================
  Files         123     483     +360     
  Lines       12844   24166   +11322     
  Branches        0    2770    +2770     
=========================================
+ Hits         9257   15927    +6670     
- Misses       3587    8061    +4474     
- Partials        0     178     +178

Impacted Files	Coverage Δ
superset/models/tags.py	58.58% <ø> (ø)	⬆️
superset/models/sql_lab.py	91.89% <100%> (+0.9%)	⬆️
superset/models/annotations.py	92% <100%> (ø)	⬆️
superset/models/schedules.py	88.88% <50%> (-2.03%)	⬇️
superset/models/core.py	83.09% <64.7%> (ø)	⬆️
superset/models/helpers.py	86.41% <81.25%> (+0.14%)	⬆️
superset/utils/cache.py	41.66% <0%> (-4.49%)	⬇️
superset/sql_validators/presto_db.py	82.43% <0%> (-2.08%)	⬇️
superset/stats_logger.py	74.41% <0%> (ø)	⬆️
superset/cli.py	37.19% <0%> (ø)	⬆️
... and 387 more

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