[Feature Request] Stop `docfx metadata` command immediately when restore failed

[filzrev]

Is your feature request related to a problem? Please describe.

docfx metadata command failed to restore project.
It show error messages only to console. But processing continues.

It's not counted as error. So it may return ExitCode: 0
It might be better to raise error and stop processing.

docfx/src/Docfx.Dotnet/DotnetApiCatalog.Compile.cs

Lines 153 to 157 in 8b43a7a

	if (!config.NoRestore)
	{
	using var process = Process.Start("dotnet", $"restore \"{path}\"");
	await process.WaitForExitAsync();
	}

Describe the solution you'd like
When restore operation failed. stop processing and show errors.