fix: set configuration service for default pool (#3535)

This is expected for a pool to set. Event if the underlying implementation would set it, this is the correct way to handle it.

Signed-off-by: Attila Mészáros <a_meszaros@apple.com>

Author: csviri

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/config/ConfigurationService.java

@@ -516,6 +516,8 @@ default boolean cloneSecondaryResourcesWhenGettingFromCache() {
       "Only the configuration API around informer pooling could still change in a"
           + " non-backwards-compatible way, the pooling itself is prod ready.")
   default InformerPool informerPool() {
-    return new DefaultInformerPool();
+    var pool = new DefaultInformerPool();
+    pool.setConfigurationService(this);
+    return pool;
   }
 }