can't have two offers with the same description

With

`lightning-cli offer -k "amount"="any" "description"="test10" "label"="testing offers"`

and

`lightning-cli offer -k "amount"="any" "description"="test10" "label"="testing offers2"`

we can't have two offers with the same description. Changing the label results in the original offer being returned instead of creating a new offer with the new label. Is the `offer_metadata` field of offers even used?

Why have a label feature if it can't be used?

In light of https://github.com/ElementsProject/lightning/issues/7710, this is problematic. Also, with https://github.com/ElementsProject/lightning/issues/7709, I don't know how to re-create an offer if the first one had no blinded paths and I want an offer with a specific description and blinded paths.