Ignore RESTEasy Classic providers found on classpath

[geoand]

These can end up on the classpath by using the Keycloak client for example and can mess up the handling of request (for example for multipart)

Follows up on: #27981

[rsvoboda]

Thanks. It solves the issue I reported on Zulip to @geoand.

Some details about the failure we have seen:
The fail was related to the fact that we have org.jboss.resteasy:resteasy-multipart-provider on the classpath

Example of failure: https://github.com/quarkus-qe/quarkus-test-suite/actions/runs/3075140578/jobs/4968408018

[INFO] Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 61.748 s - in io.quarkus.ts.http.advanced.reactive.RemoteDevModeHttpAdvancedReactiveIT
[INFO] 
[INFO] Results:
[INFO] 
Error:  Failures: 
Error:    HttpAdvancedReactiveIT>BaseHttpAdvancedReactiveIT.testMediaTypePassedToMessageBodyWriter:311->BaseHttpAdvancedReactiveIT.assertAcceptedMediaTypeEqualsResponseBody:340 1 expectation failed.
Response body doesn't match expectation.
Expected: is "application/json"
  Actual: 

[geoand]

Thanks for checking!