[builder] Remove undocumented handling of DIST_* environment variables replacements

[atoulme]

Description

Remove undocumented handling of DIST_* environment variables replacements

Link to tracking issue

Fixes #13335

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 91.77%. Comparing base (7be639f) to head (03f7e75).

Files with missing lines	Patch %	Lines
cmd/builder/internal/command.go	0.00%	0 Missing and 1 partial ⚠️

❌ Your patch check has failed because the patch coverage (0.00%) is below the target coverage (95.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13493      +/-   ##
==========================================
- Coverage   91.78%   91.77%   -0.01%     
==========================================
  Files         537      537              
  Lines       30999    30992       -7     
==========================================
- Hits        28453    28444       -9     
  Misses       2015     2015              
- Partials      531      533       +2     

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[bogdandrutu]

@atoulme can you look into the failing check? I restarted now, maybe it passes.

[atoulme]

@atoulme can you look into the failing check? I restarted now, maybe it passes.

Seems to fail on main as well: https://github.com/open-telemetry/opentelemetry-collector/actions/runs/16542475534/job/46785579476#step:10:23