RunOn.. commands - Propagate errors in restart configurations

[jsbohnert]

The RunOn{Init,Ready, etc} commands call back with a generic 'exited with code 0' message if the command is specified with its relevant 'Restart' option set to 'yes'. eg

runOnInit command exited: command exited with code 0

This PR allows underlying err result to actually be seen in logs, eg

runOnInit command exited: exec: "ffmpeg": executable file not found in %PATH%

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e6fec31) 57.35% compared to head (6b9a3f4) 57.35%.
Report is 1 commits behind head on main.

❗ Current head 6b9a3f4 differs from pull request most recent head 765873e. Consider uploading reports for the commit 765873e to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2828   +/-   ##
=======================================
  Coverage   57.35%   57.35%           
=======================================
  Files         125      125           
  Lines       11517    11517           
=======================================
  Hits         6605     6605           
  Misses       4404     4404           
  Partials      508      508           

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[aler9]

i applied gofmt and merged, thanks!

[github-actions]

This issue is mentioned in release v1.4.2 🚀
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