fix(admin): use full usbDrives[0] object as listPotentialElectionPackagesOnUsbDrive query key

[Copilot]

Addresses review feedback on #8057: the queryKey for listPotentialElectionPackagesOnUsbDrive only keyed off mount.type, so swapping to a different drive that was also mounted wouldn't trigger a refetch.

Overview

Use the full usbDrives[0] object as the query key so any drive identity change (devPath, mountPoint, etc.) produces a distinct key and forces React Query to refetch.

// Before
queryKey(usbDrives: UsbDriveInfo[]): QueryKey {
  const mountType = usbDrives[0]?.partitions[0]?.mount.type ?? 'no_drive';
  return ['listPotentialElectionPackagesOnUsbDrive', mountType];
},

// After
queryKey(usbDrives: UsbDriveInfo[]): QueryKey {
  return ['listPotentialElectionPackagesOnUsbDrive', usbDrives[0]];
},

Demo Video or Screenshot

Testing Plan

Checklist

• I have prefixed my PR title with "VxDesign: ", "VxPollBook: ", or "HWTA: " if my change is specific to one of those products.
• I have added logging where appropriate for any new user actions.
• I have added the "user-facing-change" label to this PR, if relevant, to automate an announcement in #machine-product-updates.

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