Let donators not spam the retry redeem workflow

[FlorianSW]

When a perk could not be redeemed, the donator has the possibility to retry redeeming them. However, if that does not work either, e.g. because of a persistent problem, the tool always continues to offer this retry. This can, if the donator persistently clicks the retry button, to a lot of retries (with spam in discord, when notifications are enabled) without giving any real value.

The retry redeem function should be rate limited, e.g. once every 10 minutes or so. Something not too restrictive, but still protective against spamming this feature.