Use toString for serializing enum form params in REST Client

[geoand]

• Fixes: Rest Client @RestForm does not serialize enums like other parameter types #40167

[gsmet]

I find it a bit weird that we are using toString() for serialization, mostly because I could see it used for other purposes. I would have expected to either use name() or have to use a converter.

It's mandated by the JAX-RS spec or MicroProfile?

[geoand]

JAX-RS mandates this for parameters that are serialized and do not represent the whole body

[quarkus-bot]

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