fix: Ensure config is a dict in cross filters scope migration

[kgabryje]

SUMMARY

Addresses #24581 (comment).

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

CC @padbk

[michael-s-molina]

LGTM

[codecov]

Codecov Report

Merging #24661 (94ad77b) into master (c53b249) will increase coverage by 0.01%.
The diff coverage is 50.00%.

❗ Current head 94ad77b differs from pull request most recent head 421dece. Consider uploading reports for the commit 421dece to get more accurate results

@@            Coverage Diff             @@
##           master   #24661      +/-   ##
==========================================
+ Coverage   68.97%   68.99%   +0.01%     
==========================================
  Files        1907     1907              
  Lines       74153    74153              
  Branches     8182     8177       -5     
==========================================
+ Hits        51148    51161      +13     
+ Misses      20882    20872      -10     
+ Partials     2123     2120       -3     

Flag	Coverage Δ
mysql	79.47% <ø> (?)
postgres	79.56% <ø> (-0.01%)	⬇️
presto	54.04% <ø> (+<0.01%)	⬆️
python	83.35% <ø> (+0.03%)	⬆️
sqlite	78.12% <ø> (-0.01%)	⬇️
unit	54.83% <ø> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
...hart-echarts/src/MixedTimeseries/transformProps.ts	0.78% <ø> (ø)
superset-frontend/src/components/Icons/Icon.tsx	0.00% <ø> (ø)
...tersConfigModal/FiltersConfigForm/DefaultValue.tsx	9.09% <0.00%> (ø)
...mponents/nativeFilters/FiltersConfigModal/utils.ts	46.96% <0.00%> (ø)
.../src/explore/components/ControlPanelsContainer.tsx	69.76% <0.00%> (ø)
...features/annotationLayers/AnnotationLayerModal.tsx	58.97% <ø> (ø)
...ntend/src/features/annotations/AnnotationModal.tsx	50.98% <ø> (ø)
...end/src/features/cssTemplates/CssTemplateModal.tsx	56.09% <ø> (ø)
superset/datasets/commands/create.py	100.00% <ø> (ø)
superset/examples/birth_names.py	70.00% <ø> (ø)
... and 8 more

... and 4 files with indirect coverage changes

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