Computer cmdlets should fail with error when not run via sudo on Unix

[SteveL-MSFT]

PR Summary

Computer cmdlets rely on shutdown command to work and doesn't have error handling when it fails so when run without root permissions it silently fails. Change is to check the exit code and emit the stderr message.

PR Context

Fix https://github.com/PowerShell/PowerShell/issues/19802

PR Checklist

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• [x] Summarized changes
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• Breaking changes
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  • [ ] Experimental feature(s) needed
    • [ ] Experimental feature name(s):
• User-facing changes
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  • [ ] Documentation needed
    • [ ] Issue filed:
• Testing - New and feature
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  • [x] Make sure you've added a new test if existing tests do not effectively test the code changed
• Tooling
  • [x] I have considered the user experience from a tooling perspective and don't believe tooling will be impacted.
  • OR
  • [ ] I have considered the user experience from a tooling perspective and opened an issue in the relevant tool repository. This may include:
    • [ ] Impact on PowerShell Editor Services which is used in the PowerShell extension for VSCode (which runs in a different PS Host).
      • [ ] Issue filed:
    • [ ] Impact on Completions (both in the console and in editors) - one of PowerShell's most powerful features.
      • [ ] Issue filed:
    • [ ] Impact on PSScriptAnalyzer (which provides linting & formatting in the editor extensions).
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[daxian-dbw]

@SteveL-MSFT Did you take a look at https://github.com/PowerShell/PowerShell/pull/19780 and see if it tries to fix the same?

[SteveL-MSFT]

@daxian-dbw the two PRs are complimentary and addressing different issues

[ghost]

This pull request has been automatically marked as Review Needed because it has been there has not been any activity for 7 days. Maintainer, please provide feedback and/or mark it as Waiting on Author

[pull-request-quantifier-deprecated[bot]]

This PR has 52 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Quantification details

Label      : Small
Size       : +42 -10
Percentile : 20.8%

Total files changed: 5

Change summary by file extension:
.cs : +27 -7
.resx : +3 -3
.ps1 : +12 -0

Change counts above are quantified counts, based on the PullRequestQuantifier customizations.

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