chore: refactor import command

[betodealmeida]

SUMMARY

Refactor two methods from ImportModelsCommand into functions, so they can be reused later on a new command.

This depends on #19215.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A

TESTING INSTRUCTIONS

N/A

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

[codecov]

Codecov Report

Merging #19216 (377fba6) into master (d01fdad) will increase coverage by 14.36%.
The diff coverage is 97.14%.

❗ Current head 377fba6 differs from pull request most recent head 625b774. Consider uploading reports for the commit 625b774 to get more accurate results

@@             Coverage Diff             @@
##           master   #19216       +/-   ##
===========================================
+ Coverage   52.03%   66.40%   +14.36%     
===========================================
  Files        1646     1646               
  Lines       63635    63640        +5     
  Branches     6475     6475               
===========================================
+ Hits        33112    42257     +9145     
+ Misses      28843    19703     -9140     
  Partials     1680     1680               

Flag	Coverage Δ
hive	?
mysql	81.88% <97.14%> (?)
postgres	81.92% <97.14%> (?)
presto	?
python	82.01% <97.14%> (+29.22%)	⬆️
sqlite	81.67% <97.14%> (?)

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

Impacted Files	Coverage Δ
superset/commands/importers/v1/utils.py	93.50% <96.87%> (+50.02%)	⬆️
superset/commands/importers/v1/__init__.py	94.64% <100.00%> (+62.93%)	⬆️
superset/db_engines/hive.py	0.00% <0.00%> (-85.19%)	⬇️
superset/config.py	91.79% <0.00%> (+0.31%)	⬆️
superset/common/utils/query_cache_manager.py	89.41% <0.00%> (+1.17%)	⬆️
superset/initialization/__init__.py	90.72% <0.00%> (+1.71%)	⬆️
superset/extensions.py	93.90% <0.00%> (+2.43%)	⬆️
superset/charts/data/commands/get_data_command.py	100.00% <0.00%> (+3.70%)	⬆️
superset/databases/commands/exceptions.py	96.00% <0.00%> (+4.00%)	⬆️
superset/views/sql_lab.py	60.68% <0.00%> (+4.13%)	⬆️
... and 284 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d01fdad...625b774. Read the comment docs.