Fix clean up image skipping images if there were child paths

[Abacn]

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Summary of Changes

Hello @Abacn, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request provides a critical fix to the stale_dataflow_prebuilt_image_cleaner.sh script. Previously, the script had a flaw that caused it to miss certain images during cleanup, specifically those associated with child paths. The updated logic ensures that the cleanup process now correctly identifies and includes all relevant images, preventing stale images from persisting.

Highlights

• Bug Fix: Resolved an issue in the image cleanup script where images with child paths were inadvertently skipped from the cleanup process.
• Script Logic Correction: Modified the stale_dataflow_prebuilt_image_cleaner.sh script to ensure that all image repositories are correctly identified and added to the list for cleanup, regardless of whether they have specific child image names.

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[Abacn]

R: @aIbrahiim

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Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control. If you'd like to restart, comment assign set of reviewers

[Abacn]

R: @Amar3tto