prepdata.ps1 is not doing proper error handling

[davew-msft]

Please provide us with the following information:

This issue is for a: (mark with an x)

- [x ] bug report -> please search issues before submitting
- [ ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

Minimal steps to reproduce

run azd up against the AOAISearchDemo code. when there are failures you are not bubbling up the failure.

Any log messages given by the failure

Look at Line 65...this is but one example...it's everywhere in that script...

if ($process.ExitCode -ne 0) {
Write-Host ""
Write-Warning "Installing post-deployment dependencies failed with non-zero exit code $LastExitCode."
Write-Host ""
exit $process.ExitCode
}

You are printing 0 basically, even when there is a failure.

Expected/desired behavior

should throw the correct error

OS and Version?

Windows 7, 8 or 10. Linux (which distribution). macOS (Yosemite? El Capitan? Sierra?)

Versions

Mention any other details that might be useful

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