#162788 by dww, Dave Reid, JohnAlbin, Ralf: Added disabled module and theme update checking. Woo-hoo!

when building the form for the advanced settings, the table of
settings to ignore certain projects would disappear. Now, in case
there's no cached available update data when building the form, we
force update status to fetch new data.

being confused with '5.10'.  Arguably this is a PHP bug, but we need
to work-around it for now, anyway.

update.module now in core (#94154) to provide the per-project settings
still present in the D5 update_status contrib module.