common: Use g_info() for messages that will be shown by flatpak -v

This brings us one step closer to being able to stop using the flatpak2
log domain for messages that are exclusive to `flatpak -v -v`.

Signed-off-by: Simon McVittie <smcv@collabora.com>
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f