Kafka Avro Classloading Issue in Quarkustest - SerializationException

### Bug description

In testing trying to consume data for 2 different Avro schemata leads to an exception.

-----------------------

We are using

QuarkusCamel: 3.27.0

but got this bug also in 3.20.3

Currently we are using confluenct registry, using apicurio did not change the behavior.

-----------------------

Trying to consume data for 2 different Avro schemata leads to an exception:

`org.apache.kafka.common.errors.SerializationException: Could not find class RestCallTrace specified in writer's schema whilst finding reader's schema for a SpecificRecord.`

The Route is built up like:

```
from("direct:kafka")
.routeId("FromDirect")
.process(Routes::transformToRestCallTraceOne)
.to(getKafkaFirst())
.process(Routes::transformToRestCallTraceTwo)
.to(getKafkaSecond());
```

using 2 Kafka Topics and a total of 2 Avro Schemata involved. One Schema is used in a topic exclusively.

Tests are failing consuming data from the second kafka topic.

---

Seems that the

`org.apache.avro.specific.SpecificData#classCache`

in

`org.apache.avro.specific.SpecificData#getClass`

is filled using the wrong classloader while writing the data.

In following consuming cached entry is faulty and the consuming fails.

---

A reproducer is attached.

[avro-reproducer.zip](https://github.com/user-attachments/files/23548356/avro-reproducer.zip)

Start with the attached avro-reproducer.zip and inspect org.apache.avro.specific.SpecificData#classCache and getClass, focusing on how the classloader is populated while writing data for the two Kafka topics. Reproduce the failure with the two Avro schemata; done means consuming data from the second topic no longer raises SerializationException.

Written by the indexing model from the issue text.