Storage - Content Validation Decoder Dynamic Segment Size Tests and Large GET Behavior Notes (#49172)

* tests for dynamic segment size encoding and decoding

* cleanup

* cleanup

* Apply suggestions from code review

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* style

* cant change pr name while ci is running i guess. no-op change

* cleaning up test file

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Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: ibrandes