refactor(tests): decouple unittests from integration tests

[ofekisr]

SUMMARY

unittests should not depend on app_context or any database
so I moved all tests to be under integrations_tests package, and update all ci commands and configurations

as a separate phase and PRs, unittests should move to be under unittests package, and its conftests file will not contain
app_context dependency

note - unused import removed

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #15473 (ee9d44a) into master (e606477) will decrease coverage by 0.18%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #15473      +/-   ##
==========================================
- Coverage   77.20%   77.01%   -0.19%     
==========================================
  Files         975      975              
  Lines       50842    50862      +20     
  Branches     6728     6740      +12     
==========================================
- Hits        39251    39171      -80     
- Misses      11376    11475      +99     
- Partials      215      216       +1     

Flag	Coverage Δ
hive	?
javascript	71.85% <ø> (+0.09%)	⬆️
mysql	81.64% <ø> (+<0.01%)	⬆️
postgres	81.66% <ø> (+<0.01%)	⬆️
presto	?
python	81.75% <ø> (-0.45%)	⬇️
sqlite	81.28% <ø> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
superset/db_engines/hive.py	0.00% <0.00%> (-82.15%)	⬇️
superset-frontend/src/dataMask/actions.ts	42.85% <0.00%> (-35.72%)	⬇️
superset/db_engine_specs/hive.py	69.20% <0.00%> (-17.21%)	⬇️
superset/db_engine_specs/presto.py	83.36% <0.00%> (-6.95%)	⬇️
superset-frontend/src/dataMask/reducer.ts	65.30% <0.00%> (-6.13%)	⬇️
...nfigModal/FiltersConfigForm/getControlItemsMap.tsx	85.96% <0.00%> (-5.93%)	⬇️
superset/views/database/mixins.py	81.03% <0.00%> (-1.73%)	⬇️
superset/connectors/sqla/models.py	88.22% <0.00%> (-1.65%)	⬇️
...board/components/nativeFilters/FilterBar/index.tsx	83.17% <0.00%> (-1.09%)	⬇️
superset/db_engine_specs/base.py	87.97% <0.00%> (-0.41%)	⬇️
... and 16 more

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[amitmiran137]

a simple folder migration from
tests to tests/integration-tests
as preparation for moving only unittests into separated folders that would be ran differently and will eventually reduce tests run time
LGTM!

[betodealmeida]

Thank you so much for this PR, @ofekisr! I started adding some (proper) unit tests and it's so good to have them run almost instantaneously.