Improve log message when event is fired

When pull-replication is not fully loaded, events are stored in
the memory queue. This fact is logged in the `pull_replication_log`
file. For better readability, add all information about the stored
event.

Bug: Issue 307574381
Change-Id: Ife992fefdf1a8bb880ffcc69aa0ab14ed08afe0b

src/main/java/com/googlesource/gerrit/plugins/replication/pull/ReplicationQueue.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/ReplicationQueue.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/ReplicationQueue.java
index 1ba47de..5f4f5bc 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/ReplicationQueue.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/ReplicationQueue.java
@@ -219,7 +219,10 @@
   private void fire(ReferenceUpdatedEvent event, ReplicationState state) {
     if (!running) {
       stateLog.warn(
-          "Replication plugin did not finish startup before event, event replication is postponed",
+          String.format(
+              "Replication plugin did not finish startup before event, event replication is postponed"
+                  + " for event %s",
+              event),
           state);
       beforeStartupEventsQueue.add(event);