[CI] print and include the sha256 checksum of the boot tools and util

[zhangchiqing]

This PR adds the sha256 checksum of the boot tools and util to its tar files.

See result https://github.com/onflow/flow-go/actions/runs/10569117930/job/29281315382

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.49%. Comparing base (e211841) to head (dbeae1a).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6404      +/-   ##
==========================================
- Coverage   41.49%   41.49%   -0.01%     
==========================================
  Files        2015     2015              
  Lines      143641   143641              
==========================================
- Hits        59605    59597       -8     
- Misses      77863    77869       +6     
- Partials     6173     6175       +2     

Flag	Coverage Δ
unittests	41.49% <ø> (-0.01%)	⬇️

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