Re-enable DRUID_IS_ACTIVE flag

[willbarrett]

CATEGORY

Choose one

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

SUMMARY

The DRUID_IS_ACTIVE configuration option was removed from the codebase at some point. Druid's preferred connection method is via the SQL interface, so this change is necessary in order to deprecate the Druid API-based connection methods in Superset.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TEST PLAN

• Boot Superset with the configuration option DRUID_IS_ACTIVE set to True, ensure Druid options appear in the "Sources" menu.
• Boot Superset with the configuration option DRUID_IS_ACTIVE set to False, ensure Druid options are absent from the "Sources" menu.

ADDITIONAL INFORMATION

• Has associated issue: Make pydruid truly optional #8463 - I decided to split this change out of that PR for clarity and simplicity.
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

REVIEWERS

@mistercrunch @dpgaspar

[codecov-io]

Codecov Report

Merging #8482 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #8482      +/-   ##
==========================================
+ Coverage   66.52%   66.53%   +<.01%     
==========================================
  Files         449      449              
  Lines       22595    22600       +5     
  Branches     2367     2367              
==========================================
+ Hits        15032    15037       +5     
  Misses       7425     7425              
  Partials      138      138

Impacted Files	Coverage Δ
superset/connectors/druid/views.py	69.12% <100%> (+0.2%)	⬆️
superset/assets/src/SqlLab/actions/sqlLab.js	60.45% <0%> (ø)	⬆️
superset/views/core.py	72.17% <0%> (+0.01%)	⬆️
superset/sql_lab.py	77.93% <0%> (+0.31%)	⬆️

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[mistercrunch]

LGTM, @craig-rueda heads up that this may merge conflict with your big PR

[mistercrunch]