Do not use the Update modules cache of UPdate XML so we can control how long it is cached

To accomplish the plan in 📌 [policy, no patch] Use Update XML in Package manager to determine release support status Active we will probably need to the current issue.
Especially this part:

We should also check that the available versions returned by the Update XML, just the numbers not the metadata unknown to Composer, match the available versions as known to Composer (composer info -a).

If are going to check against versions know by release we can't rely an old version of the update xml or they might be out of sync.