fix(viz): update nesting logic to handle multiple dimensions in PartitionViz

[DamianPendrak]

Fixes #32042

SUMMARY

Updated nest_values to support multiple dimensions, enabling correct filtering of nested properties.

ADDITIONAL INFORMATION

• Has associated issue: Partition Chart renders subcategories incorrectly when using more than two dimensions #32042
• 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

[korbit-ai]

Review by Korbit AI

Korbit automatically attempts to detect when you fix issues in new commits.

Category	Issue	Fix Detected
	Invalid list concatenation ▹ view	✅
	Missing dimension validation in nested structure ▹ view	✅

Files scanned

​

File Path	Reviewed
superset/viz.py	✅

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[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 83.45%. Comparing base (76d897e) to head (df5a139).
Report is 1453 commits behind head on master.

Files with missing lines	Patch %	Lines
superset/viz.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #32290       +/-   ##
===========================================
+ Coverage   60.48%   83.45%   +22.96%     
===========================================
  Files        1931      546     -1385     
  Lines       76236    39101    -37135     
  Branches     8568        0     -8568     
===========================================
- Hits        46114    32632    -13482     
+ Misses      28017     6469    -21548     
+ Partials     2105        0     -2105     

Flag	Coverage Δ
hive	48.49% <0.00%> (-0.67%)	⬇️
javascript	?
mysql	75.85% <80.00%> (?)
postgres	75.92% <80.00%> (?)
presto	53.02% <0.00%> (-0.79%)	⬇️
python	83.45% <80.00%> (+19.96%)	⬆️
sqlite	75.43% <80.00%> (?)
unit	61.06% <0.00%> (+3.43%)	⬆️

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