test: add missing tests for transform functions

[fabriziosestito]

Description

Add missing transform tests

[Copilot]

Pull request overview

This PR adds missing unit tests for storage-layer cache transform helpers, ensuring the “strip” transforms correctly remove large payload fields while preserving object identity metadata.

Changes:

• Add a test for TransformStripNodeSBOM verifying the SPDX payload is removed and name is preserved.
• Add a test for TransformStripNodeVulnerabilityReport verifying the report results are removed and name is preserved.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.94%. Comparing base (5adb1bd) to head (d730f42).
⚠️ Report is 36 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1239      +/-   ##
==========================================
- Coverage   53.44%   49.94%   -3.50%     
==========================================
  Files          61       77      +16     
  Lines        5340     6479    +1139     
==========================================
+ Hits         2854     3236     +382     
- Misses       2088     2784     +696     
- Partials      398      459      +61     

Flag	Coverage Δ
unit-tests	49.94% <ø> (-3.50%)	⬇️

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