fix: restore .value access when using -AllPages on group queries

Invoke-GraphRequest with -AllPages returns the full response object
with accumulated items in .value, not a flat array.

Scripts/Bulk-AppAssignment.ps1

@@ -253,7 +253,7 @@ Write-Host "Selected $($selectedApps.Count) apps." -ForegroundColor Green
 #region Load Groups
 Write-Host "`nLoading Azure AD groups..." -ForegroundColor Cyan
 $groupsResponse = Invoke-GraphRequest "/groups?`$select=id,displayName&`$orderby=displayName" -AllPages
-$groups = $groupsResponse | Where-Object { $_.displayName } | Sort-Object displayName
+$groups = $groupsResponse.value | Where-Object { $_.displayName } | Sort-Object displayName
 Write-Host "Found $($groups.Count) groups." -ForegroundColor Green
 
 $groupDisplayNames = $groups | ForEach-Object { "$($_.displayName) [$($_.id)]" }