[multimod] Resolve version for commit per module instead of per module set

[mx-psi]

Fixes open-telemetry/opentelemetry-collector/issues/9827

[codecov]

Codecov Report

Attention: Patch coverage is 95.23810% with 1 line in your changes missing coverage. Please review.

Project coverage is 60.74%. Comparing base (78f03ee) to head (60ca64d).

Files	Patch %	Lines
multimod/internal/prerelease/prerelease.go	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #582      +/-   ##
==========================================
+ Coverage   60.64%   60.74%   +0.09%     
==========================================
  Files          40       40              
  Lines        1964     1969       +5     
==========================================
+ Hits         1191     1196       +5     
  Misses        626      626              
  Partials      147      147              

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[mx-psi]

I tried this out on open-telemetry/opentelemetry-collector-contrib/pull/33977. It works correctly, although it is a bit slower at first and faster at the tidying stage (likely because the Go proxy is caching the version at an earlier stage). The overall time feels about the same.

[codeboten]

Thanks @mx-psi!