Fix PushOne toString() to show the right refs and hidden number

Include all refs without applying any limit when `maxRefsToShow`
is set to 0 and limit the displayed refs to the specified maximum
when `maxRefsToShow` is greater than 0. Previously, the method
always limited the number of refs to `maxRefsToShow`, and
`maxRefsToShow` was updated to the batch count when initially
set to 0.

Remove the calculation of hidden refs to avoid performance
issues with millions of refs.

Bug: Issue 375798125
Release-Notes: skip
Change-Id: I30aae0cebf4fe28309542808baeeb316e1e7fb52

src/main/java/com/googlesource/gerrit/plugins/replication/PushOne.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/PushOne.java b/src/main/java/com/googlesource/gerrit/plugins/replication/PushOne.java
index a648845..c9b9994 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/PushOne.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/PushOne.java
@@ -69,6 +69,7 @@
 import java.util.Set;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.stream.Collectors;
+import java.util.stream.Stream;
 import org.eclipse.jgit.errors.NoRemoteRepositoryException;
 import org.eclipse.jgit.errors.NotSupportedException;
 import org.eclipse.jgit.errors.RemoteRepositoryException;
@@ -246,18 +247,14 @@
   protected String getLimitedRefs() {
     Set<ImmutableSet<String>> refs = getRefs();
     int maxRefsToShow = replConfig.getMaxRefsToShow();
-    if (maxRefsToShow == 0) {
-      maxRefsToShow = refs.size();
-    }
-    String refsString =
-        refs.stream()
-            .flatMap(Collection::stream)
-            .limit(maxRefsToShow)
-            .collect(Collectors.joining(" "));
-    int hiddenRefs = refs.size() - maxRefsToShow;
-    if (hiddenRefs > 0) {
-      refsString += " (+" + hiddenRefs + ")";
-    }
+
+    Stream<String> refsStream = refs.stream().flatMap(Collection::stream);
+
+    Stream<String> refsFiltered =
+        (maxRefsToShow == 0) ? refsStream : refsStream.limit(maxRefsToShow);
+
+    String refsString = refsFiltered.collect(Collectors.joining(" "));
+
     return "[" + refsString + "]";
   }