Revert "Mark Quartz extension as stable"

(cherry picked from commit 84609f6)

Author: gsmet

docs/src/main/asciidoc/quartz.adoc

@@ -6,10 +6,13 @@ https://github.com/quarkusio/quarkus/tree/main/docs/src/main/asciidoc
 = Scheduling Periodic Tasks with Quartz
 
 include::./attributes.adoc[]
+:extension-status: preview
 
 Modern applications often need to run specific tasks periodically.
 In this guide, you learn how to schedule periodic clustered tasks using the http://www.quartz-scheduler.org/[Quartz] extension.
 
+include::{includes}/extension-status.adoc[]
+
 TIP: If you only need to run in-memory scheduler use the xref:scheduler.adoc[Scheduler] extension.
 
 == Prerequisites

extensions/quartz/runtime/src/main/resources/META-INF/quarkus-extension.yaml

@@ -10,6 +10,6 @@ metadata:
   guide: "https://quarkus.io/guides/quartz"
   categories:
   - "miscellaneous"
-  status: "stable"
+  status: "preview"
   config:
-  - "quarkus.quartz."
+  - "quarkus.quartz."