GPG check: do not raise an error when TargetUserSpaceInfo is missing

[pirat89]

Previously, if the upgrade has been inhibited during TargetTransactionFactsCollectionPhase usually because we could not create (for whatever reason) the target userspace container, the actor checking rpm gpg keys failed with the Could not check for valid GPG keys error. This has confused many users as they couldn't know that this is impacted by the problem described in an inhibitor that is below this error.

As it's for sure that the upgrade cannot continue when the target user space container has not been created (the TargetUserSpaceInfo msg is missing), we consider it safe to stop the gpg check here silently just with a warning msg instead of raising the error - as this check is important only in case we could actually upgrade.

All other possible raised errors are presereved.

jira: https://issues.redhat.com/browse/RHEL-30573

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[matejmatuska]

/packit copr-build

[Jakuje]

Closed in favor of #1269, which fixed the test failures in here.

[Rezney]

Closing in favor of https://github.com/oamg/leapp-repository/pull/1269 as we could not push to the branch.