Handle command output errors

[paramah]

Summary

• propagate execution errors from ExecCmdOutput
• halt pruning helpers when command output retrieval fails

Testing

• go test ./... (fails: log.Println call has possible Printf formatting directive %v)
• go test -vet=off ./...

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https://chatgpt.com/codex/tasks/task_e_689cf0b643248330ab86b03fb5e2f3c4

[what-the-diff]

PR Summary

• Better Error Handling in Crucial Functions
  The error handling of key operations like 'pruning' containers, images, volumes, and networks has been improved. If an error happens during these operations, it is now not only caught but also reported in an easily understood way to the user.

• Improved Command Execution Reporting
  The 'ExecCmdOutput' function, which is used to execute commands, has been updated. Now, if there happens to be a mishap during a command's execution, it won't be overlooked. Instead, an error message will be presented, aiding in quick recognition and diagnosis of problems.