Revert "Unlist quarkus-resteasy-qute and quarkus-resteasy-reactive-qute"

This reverts commit 5e8e7e6.

This has been done too fast:
- we haven't documented it at all
- there are still references to these extensions in our documentation
  (https://quarkus.io/guides/qute-reference#resteasy_integration) and
  people can't find the extensions anymore (see
  #37478)

We need to finalize the documentation before actually unlisting these
extensions.
I would advise to target 3.7 for that.

(cherry picked from commit 1db3889)

extensions/resteasy-classic/resteasy-qute/runtime/src/main/resources/META-INF/quarkus-extension.yaml

@@ -2,7 +2,6 @@
 artifact: ${project.groupId}:${project.artifactId}:${project.version}
 name: "RESTEasy Classic Qute"
 metadata:
-  unlisted: true
   keywords:
   - "templating"
   - "templates"

extensions/resteasy-reactive/quarkus-resteasy-reactive-qute/runtime/src/main/resources/META-INF/quarkus-extension.yaml

@@ -1,7 +1,6 @@
 name: "RESTEasy Reactive Qute"
 artifact: ${project.groupId}:${project.artifactId}:${project.version}
 metadata:
-  unlisted: true
   keywords:
     - "templating"
     - "templates"