Do not ask for admin password for upgrade --check

[mcrha]

Describe the bug

When calling rpm-ostree upgrade --check I'm asked for the root/admin password with an explanation "Authentication is required to update software`, but I'm not updating the software, I'm only checking what updates are available. It can modify some internal states, like the CachedUpdates, but, I think, it's not really needed to ask for the root/admin password in this case.

This applies also to the D-Bus interface.

Similarly when issuing AutomaticUpdateTrigger with mode=check over D-Bus.

Rationale: this provides bad user experience for the users of the gnome-software, because it's checked for updates shortly after the app is started (around a minute), thus after the user logs in. The sudden out of blue password prompt is disturbing and confusing.

Reproduction steps

run rpm-ostree upgrade --check

Expected behavior

No root/admin password

Actual behavior

Asks for root/admin password

System details

rpm-ostree-2024.5-2.fc40.x86_64

rpm-ostree:
 Version: '2024.5'
 Git: 4479e824f94b09ec3f6c34f15b08f3813644fff6
 Features:
  - rust
  - compose
  - container
  - fedora-integration

Additional information

No response