chore: change the visibility of BuildValueTransformer from private to public

[wangyelei]

No description provided.

[apecloud-bot]

Auto Cherry-pick Instructions

Usage:
  - /nopick: Not auto cherry-pick when PR merged.
  - /pick: release-x.x [release-x.x]: Auto cherry-pick to the specified branch when PR merged.

Example:
  - /nopick
  - /pick release-1.0

[wangyelei]

/approved

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.80%. Comparing base (75b11f0) to head (4999b52).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9575      +/-   ##
==========================================
- Coverage   59.82%   59.80%   -0.03%     
==========================================
  Files         518      518              
  Lines       56343    56345       +2     
==========================================
- Hits        33706    33695      -11     
- Misses      19615    19628      +13     
  Partials     3022     3022              

Flag	Coverage Δ
unittests	59.80% <100.00%> (-0.03%)	⬇️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[apecloud-bot]

/cherry-pick release-1.0

[apecloud-bot]

🤖 says: cherry pick action finished successfully 🎉!
See: https://github.com/apecloud/kubeblocks/actions/runs/16611559935