[BUG] oneOfUsingField fails for case object enums that inherit enumeratum EnumEntry reproducer

[seglo]

Similar to #1950 this example is unable to compile. I think the main distinction is the use of enumeratum.EnumEntry and possibly the conflicting tapir configuration that this case is trying to override with a custom mapping for the discriminator.

[error] /home/seglo/source/tapir/integrations/enumeratum/src/test/scala/sttp/tapir/codec/enumeratum/TapirCodecEnumeratumTest.scala:138:83: type mismatch;
[error]   ee.type|OfferType with scala.Product with java.io.Serializable
[error]       Schema.oneOfUsingField[CreateOfferRequest, OfferType](_.`type`, _.entryName)(
[error]                                                                                   ^

[adamw]

Closes #1981