ENH: Better DoRA check in mixed adapter batch inference (#2089)
This is a bit of an edge case, but I noticed this while working on
something else.
PEFT allows mixed batch adapter inference, i.e. when predicting, the
same batch can use different adapters by passing the adapter_names
argument. However, this is not supported for DoRA (yet), so there is a
check that raises an error if DoRA is used.
Previously, this check would check all adapters for DoRA, even if those
adapters are not being used in adapter_names. This was unnecessarily
strict and with this PR, we only check the adapters that are actually
being used.
