Move function in utils folder to fix circular import issues

[willbarrett]

CATEGORY

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

SUMMARY

A function in superset/utils/core.py had a circular import fix applied to it (required in utils/core due to it being depended on by the model layer) but it was only referenced in one place, in another utils file. Moving it to that file removes the need for the circular import fix.

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

@dpgaspar @craig-rueda

[craig-rueda]

LGTM

[codecov-io]

Codecov Report

Merging #8814 into master will increase coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #8814      +/-   ##
==========================================
+ Coverage   65.84%   65.88%   +0.03%     
==========================================
  Files         483      483              
  Lines       24177    24175       -2     
  Branches     2777     2777              
==========================================
+ Hits        15920    15928       +8     
+ Misses       8079     8069      -10     
  Partials      178      178

Impacted Files	Coverage Δ
superset/utils/dashboard_import_export.py	58.97% <100%> (+28.53%)	⬆️
superset/utils/core.py	87.71% <100%> (-0.38%)	⬇️
superset/db_engine_specs/postgres.py	83.33% <0%> (+27.77%)	⬆️

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