fix(native-filters): cascading filters not rendering in tab

[villebro]

SUMMARY

#14933 caused a regression for cascading filters. This was caused by the fact that filters with a parent aren't rendered in the filter tab, causing index referencing to the array of nodes in the portal to fall out of sync. This PR does the following:

• does not attempt to render a cascading popover for nodes that have a parent (these will be rendered within the parent's popover)
• checks the index for the in scope filters from the unfiltered filter array, as the portal node needs to be referenced by this (not the filtered cascading filter array).

BEFORE

Cascading filters caused an error when rendering the filter tab due to the index being referenced on the unfiltered portal node array didn't exist on the cascade filters array:

AFTER

Now cascading filters show up as expected ("Continent" is the parent of "Country", while "Country code" is unhierarchical):

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• 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 #14964 (b93728c) into master (e6bc7c9) will increase coverage by 0.00%.
The diff coverage is 80.00%.

@@           Coverage Diff           @@
##           master   #14964   +/-   ##
=======================================
  Coverage   77.62%   77.62%           
=======================================
  Files         965      965           
  Lines       49519    49521    +2     
  Branches     6263     6263           
=======================================
+ Hits        38440    38442    +2     
  Misses      10878    10878           
  Partials      201      201           

Flag	Coverage Δ
javascript	72.50% <80.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
...ilters/FilterBar/FilterControls/FilterControls.tsx	77.58% <80.00%> (+0.80%)	⬆️

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