[chore] Add test coverage of version.go files

[MrAlias]

Based on https://github.com/open-telemetry/opentelemetry-go/blob/main/version_test.go

This addresses the cover failure for releases: #6435 (comment)

[XSAM]

Should we use a template for these? Not a blocker, though.

[MrAlias]

Should we use a template for these? Not a blocker, though.

Not sure it will save us much. I'm not opposed if you want to look into it after this is merged though.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.3%. Comparing base (3637e7f) to head (ef0c33c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #6443     +/-   ##
=======================================
+ Coverage   68.0%   68.3%   +0.3%     
=======================================
  Files        200     200             
  Lines      16682   16682             
=======================================
+ Hits       11344   11404     +60     
+ Misses      4995    4933     -62     
- Partials     343     345      +2     

see 23 files with indirect coverage changes