other(mypy): Enable warn_unused_ignores

[john-bodley]

SUMMARY

I'm not sure exactly why warn_unused_ignores was set to false, but this PR switches the flag to true to ensure the code remains clean as of any unnecessary # type: ignore comments. Given that Mypy is continually evolving and stubs added it's not uncommon for type resolution to change over time.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

CI.

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 #20884 (9529337) into master (50d2e5a) will decrease coverage by 11.48%.
The diff coverage is 33.33%.

@@             Coverage Diff             @@
##           master   #20884       +/-   ##
===========================================
- Coverage   66.31%   54.83%   -11.49%     
===========================================
  Files        1758     1758               
  Lines       67008    67008               
  Branches     7107     7107               
===========================================
- Hits        44437    36744     -7693     
- Misses      20749    28442     +7693     
  Partials     1822     1822               

Flag	Coverage Δ
hive	53.25% <33.33%> (ø)
mysql	?
postgres	?
presto	53.15% <33.33%> (ø)
python	57.84% <33.33%> (-23.71%)	⬇️
sqlite	?
unit	50.25% <33.33%> (ø)

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

Impacted Files	Coverage Δ
superset/models/helpers.py	37.32% <20.00%> (-3.46%)	⬇️
superset/utils/core.py	62.88% <100.00%> (-27.36%)	⬇️
superset/utils/dashboard_import_export.py	0.00% <0.00%> (-100.00%)	⬇️
superset/key_value/commands/update.py	0.00% <0.00%> (-88.89%)	⬇️
superset/key_value/commands/delete.py	0.00% <0.00%> (-85.30%)	⬇️
superset/key_value/commands/delete_expired.py	0.00% <0.00%> (-80.77%)	⬇️
superset/dashboards/commands/importers/v0.py	15.62% <0.00%> (-76.25%)	⬇️
superset/datasets/commands/update.py	25.30% <0.00%> (-68.68%)	⬇️
superset/datasets/commands/create.py	29.41% <0.00%> (-68.63%)	⬇️
superset/datasets/commands/importers/v0.py	24.03% <0.00%> (-67.45%)	⬇️
... and 280 more

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