solver3: Handle previously satisfied Suggests last

In #2103556 we can see that avahi-daemon Suggests avahi-autoipd, which is previously satisfied by dhcpcd-base due to a Provides; that Provides has now been dropped; and solver3 keeps the update back.

As in LP: #2102720 this is a Suggests and it seems wrong for the Suggests to actually influence dependency choices and be able to hold back updates.

Instead, satisfy previously satisfied Suggests at the end. For the particular case in this bug report, this results in avahi-autoipd, the real package, to be installed to keep the Suggests working which needs further consideration whether that is the right choice (we can argue either way), but in any case this is a better solution.

LP: #2103556