fix(load examples): revert #12351

[betodealmeida]

This reverts commit f354bb3.

The change in #12351 makes the examples data to be loaded into the main database instead of the examples database.

@dpgaspar let's discuss a way of not creating the unnecessary connection?

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

[codecov-io]

Codecov Report

Merging #12701 (7600f6e) into master (7e77975) will decrease coverage by 3.08%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master   #12701      +/-   ##
==========================================
- Coverage   66.93%   63.85%   -3.09%     
==========================================
  Files        1019      487     -532     
  Lines       49824    30014   -19810     
  Branches     4877        0    -4877     
==========================================
- Hits        33350    19164   -14186     
+ Misses      16351    10850    -5501     
+ Partials      123        0     -123     

Flag	Coverage Δ
cypress	?
javascript	?
python	63.85% <50.00%> (-0.30%)	⬇️

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Impacted Files	Coverage Δ
superset/datasets/commands/importers/v1/utils.py	55.55% <50.00%> (ø)
superset/sql_validators/postgres.py	50.00% <0.00%> (-50.00%)	⬇️
superset/databases/commands/create.py	83.67% <0.00%> (-8.17%)	⬇️
superset/databases/commands/update.py	85.71% <0.00%> (-8.17%)	⬇️
superset/db_engine_specs/sqlite.py	90.62% <0.00%> (-6.25%)	⬇️
superset/databases/commands/test_connection.py	84.78% <0.00%> (-4.35%)	⬇️
superset/utils/celery.py	96.42% <0.00%> (-3.58%)	⬇️
superset/models/core.py	85.86% <0.00%> (-2.99%)	⬇️
superset/views/core.py	72.82% <0.00%> (-2.48%)	⬇️
superset/db_engine_specs/mysql.py	89.79% <0.00%> (-2.05%)	⬇️
... and 542 more

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