QUARKUS-2019 - Tech preview support for resteasy-reactive-jaxb

JIRA link: https://issues.redhat.com/browse/QUARKUS-2019

Tech preview support for resteasy-reactive-jaxb

Scope of the testing

Review upstream coverage
Ensure Marete config gets updates
Test development in case of missing test coverage

Getting familiar with the feature

Following actions were taken to ensure familiarity:

Focus on exploratory testing of the feature

Automated test development

No need for additional test coverage, PR with the feature is well done.
https://github.com/quarkusio/quarkus/pull/20773/files contains reasonable test coverage with 16 tests

Advanced topics for test development

N/A