Adding app context wrapper to Celery tasks

[craig-rueda]

CATEGORY

Choose one

• Bug Fix
• Enhancement (new features, refinement)

SUMMARY

We noticed that after my previous PR, Celery tasks weren't working properly, with an error being emitted around the lack of an active app context. This PR addresses the lack of app context. We also noticed that the loggers in sql_lab weren't following best practices around fetching loggers at bootstrap time.

• Adds app_context wrapper around all calls to Celery tasks
• Migrating from logging.xxx() to logging.getLogger with subsequent calls to resulting logger

Fixes #8651

REVIEWERS

@mistercrunch

[codecov-io]

Codecov Report

Merging #8653 into master will increase coverage by 0.01%.
The diff coverage is 69.23%.

@@            Coverage Diff             @@
##           master    #8653      +/-   ##
==========================================
+ Coverage   65.76%   65.77%   +0.01%     
==========================================
  Files         482      482              
  Lines       23824    23834      +10     
  Branches     2594     2594              
==========================================
+ Hits        15667    15676       +9     
- Misses       7984     7985       +1     
  Partials      173      173

Impacted Files	Coverage Δ
superset/app.py	80.13% <100%> (+1.15%)	⬆️
superset/sql_lab.py	78.03% <55.55%> (+0.1%)	⬆️
superset/db_engine_specs/presto.py	22.58% <0%> (-0.06%)	⬇️

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