fix: check that imports are ZIPs

[betodealmeida]

SUMMARY

Check that imports are actually ZIP files.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

After:

TESTING INSTRUCTIONS

Working on unit tests.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• 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

[betodealmeida]

Going to remove this.

[codecov]

Codecov Report

Merging #21875 (6007d34) into master (54f6fd6) will increase coverage by 0.01%.
The diff coverage is 83.33%.

❗ Current head 6007d34 differs from pull request most recent head a9490b9. Consider uploading reports for the commit a9490b9 to get more accurate results

@@            Coverage Diff             @@
##           master   #21875      +/-   ##
==========================================
+ Coverage   66.90%   66.91%   +0.01%     
==========================================
  Files        1805     1806       +1     
  Lines       69081    69163      +82     
  Branches     7378     7391      +13     
==========================================
+ Hits        46218    46283      +65     
- Misses      20953    20969      +16     
- Partials     1910     1911       +1     

Flag	Coverage Δ
hive	52.91% <50.00%> (-0.01%)	⬇️
mysql	78.37% <75.00%> (+0.01%)	⬆️
postgres	78.43% <75.00%> (+0.01%)	⬆️
presto	52.82% <50.00%> (-0.01%)	⬇️
python	81.49% <83.33%> (+0.02%)	⬆️
sqlite	76.91% <75.00%> (+0.01%)	⬆️
unit	51.10% <66.66%> (+0.03%)	⬆️

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

Impacted Files	Coverage Δ
superset/charts/api.py	85.76% <75.00%> (-0.27%)	⬇️
superset/queries/saved_queries/api.py	94.44% <75.00%> (-0.84%)	⬇️
superset/databases/api.py	95.55% <100.00%> (+0.02%)	⬆️
...frontend/src/components/Chart/ChartContextMenu.tsx	11.53% <0.00%> (-32.47%)	⬇️
...et-frontend/src/components/Chart/ChartRenderer.jsx	51.25% <0.00%> (-2.18%)	⬇️
superset/initialization/__init__.py	91.00% <0.00%> (-0.47%)	⬇️
...ins/plugin-chart-table/src/DataTable/DataTable.tsx	38.46% <0.00%> (-0.34%)	⬇️
superset/models/core.py	89.79% <0.00%> (-0.33%)	⬇️
superset/views/base.py	75.70% <0.00%> (ø)
superset/examples/tabbed_dashboard.py	0.00% <0.00%> (ø)
... and 24 more

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[dpgaspar]

LGTM, after removing the frontend change, also can you add a test also?