fix(migration): Ensure cascadeParentIds key exists

[john-bodley]

SUMMARY

Sorry this issue only surfaced whilst testing on a more recent corpus of Airbnb's data. It seems that there could be instances where the cascadeParentIds key does not exist for a given native dashboard filter. This change adds a safeguard for such an event.

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 #24831 (c24a1ed) into master (5bb8e0d) will not change coverage.
The diff coverage is n/a.

❗ Current head c24a1ed differs from pull request most recent head e6747b9. Consider uploading reports for the commit e6747b9 to get more accurate results

@@           Coverage Diff           @@
##           master   #24831   +/-   ##
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  Coverage   68.99%   68.99%           
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  Files        1903     1903           
  Lines       74072    74072           
  Branches     8193     8193           
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  Hits        51104    51104           
  Misses      20847    20847           
  Partials     2121     2121           

Flag	Coverage Δ
hive	54.13% <ø> (ø)
mysql	79.21% <ø> (ø)
postgres	79.31% <ø> (ø)
presto	54.03% <ø> (ø)
python	83.36% <ø> (ø)
sqlite	77.88% <ø> (ø)
unit	54.99% <ø> (ø)

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[michael-s-molina]

LGTM