NuGet v3 dependencies - Fix #1840

[o-l-a-v]

PR Summary

I wrongfully checked for property @id both in dependencyGroups and dependencies, but that property is not mandatory as pointed out by @fflaten.

This should fix #1840 by:

• Don't check for any property in dependencyGroups.
• Check for property id instead of @id for dependencies.

Tested like so:

# Build the project
& <project_root>\build.ps1 -Clean -Build -BuildFramework net472

# Import the built DLL
Import-Module -Name '<project_root>\out\Microsoft.PowerShell.PSResourceGet\Microsoft.PowerShell.PSResourceGet.dll'

# Register necessary resource repositories if not present
foreach ($Repository in 'pwsh.gallery', 'preview.pwsh.gallery') {
    if ((Get-PSResourceRepository).Where{$_.'Name' -eq $Repository}.'Count' -le 0) {
        Write-Information -InformationAction 'Continue' -MessageData (
            '"{0}" was not already registered.' -f $Repository
        )
        Register-PSResourceRepository -Name $Repository `
            -Uri ('https://{0}/index.json' -f $Repository) -ApiVersion 'v3' -Priority 60
    }
    else {
        Write-Information -InformationAction 'Continue' -MessageData (
            '"{0}" was already registered.' -f $Repository
        )
    }
}

# Find a package we know will have dependencies
## pwsh.gallery
(Find-PSResource -Repository 'pwsh.gallery' -Name 'Az').'Dependencies'
## preview.pwsh.gallery
(Find-PSResource -Repository 'preview.pwsh.gallery' -Name 'Az').'Dependencies'

# Check what Save-PSResource would do
Save-PSResource -Repository 'pwsh.gallery' -TrustRepository -Name 'Az' -WhatIf

PR Context

PR Checklist

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• Make sure all .h, .cpp, .cs, .ps1 and .psm1 files have the correct copyright header
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• Breaking changes
  • None
  • OR
  • Documentation needed
    • Issue filed:
• User-facing changes
  • Not Applicable
  • OR
  • Documentation needed
    • Issue filed:
• Testing - New and feature
  • N/A or can only be tested interactively
  • OR
  • Make sure you've added a new test if existing tests do not effectively test the code changed
• Tooling
  • I have considered the user experience from a tooling perspective and don't believe tooling will be impacted.
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