chore: Fix deprecated unittest aliases.

[tirkarthi]

SUMMARY

Fix deprecated unittest aliases. The deprecated aliases were removed in Python 3.11 and the change was reverted later to keep warnings only. Similar to #17562

Command to check for deprecated aliases

rg -t py 'assertEquals|assertNotEquals|assertAlmostEquals|assertNotAlmostEquals|assertRegexpMatches|assertNotRegexpMatches|assertRaisesRegexp|failUnlessEqual|failIfEqual|failUnlessAlmostEqual|failUnless|failUnlessRaises|failIf|assertDictContainsSubset|_TextTestResult'

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

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 #19042 (21b8cef) into master (8c52fe3) will decrease coverage by 0.19%.
The diff coverage is n/a.

❗ Current head 21b8cef differs from pull request most recent head 4c9cf36. Consider uploading reports for the commit 4c9cf36 to get more accurate results

@@            Coverage Diff             @@
##           master   #19042      +/-   ##
==========================================
- Coverage   66.52%   66.33%   -0.20%     
==========================================
  Files        1641     1641              
  Lines       63476    63476              
  Branches     6444     6444              
==========================================
- Hits        42227    42106     -121     
- Misses      19585    19706     +121     
  Partials     1664     1664              

Flag	Coverage Δ
hive	?
mysql	81.81% <ø> (ø)
postgres	81.86% <ø> (ø)
presto	?
python	81.90% <ø> (-0.39%)	⬇️
sqlite	?

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%> (-85.19%)	⬇️
superset/db_engine_specs/hive.py	70.00% <0.00%> (-15.77%)	⬇️
superset/db_engine_specs/presto.py	83.47% <0.00%> (-5.65%)	⬇️
superset/db_engine_specs/sqlite.py	91.89% <0.00%> (-5.41%)	⬇️
superset/connectors/sqla/utils.py	88.23% <0.00%> (-3.93%)	⬇️
superset/utils/celery.py	86.20% <0.00%> (-3.45%)	⬇️
superset/result_set.py	96.77% <0.00%> (-1.62%)	⬇️
superset/databases/commands/test_connection.py	98.57% <0.00%> (-1.43%)	⬇️
superset/connectors/sqla/models.py	88.87% <0.00%> (-1.24%)	⬇️
superset/utils/cache.py	73.58% <0.00%> (-0.95%)	⬇️
... and 4 more

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[villebro]

Thanks for the cleanup @tirkarthi !