[FIXED JENKINS-27716] - Disable archived promotion jobs

Since 1.585, the promotion must explicitly indicate that it can be disabled.
Otherwise, promotions which trigger automatically upon build completion will
execute, even if they're archived.

See hudson.model.AbstractProject#makeDisabled(boolean) for additional details.

src/main/java/hudson/plugins/promoted_builds/PromotionProcess.java

@@ -153,6 +153,15 @@ public AbstractProject<?,?> getOwner() {
         return getOwner().getACL();
     }
 
+    /**
+     * JENKINS-27716: Since 1.585, the promotion must explicitly indicate that
+     * it can be disabled. Otherwise, promotions which trigger automatically
+     * upon build completion will execute, even if they're archived.
+     */
+    @Override public boolean supportsMakeDisabled() {
+        return true;
+    }
+
     /**
      * Get the promotion condition by referencing it fully qualified class name
      */