Suppress UnnecessaryAssignment in withBaseOnly factory method

withBaseOnly() intentionally assigns an @Inject field to support an
alternate construction path. Suppress Error Prone's
UnnecessaryAssignment warning for this method.

Change-Id: I30cc92f830d562d87bd0437d8ac374ed0a2f7295

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

diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/MergedConfigResource.java b/src/main/java/com/googlesource/gerrit/plugins/replication/MergedConfigResource.java
index 58a10f0..541b0f4 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/MergedConfigResource.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/MergedConfigResource.java
@@ -34,8 +34,11 @@
 public class MergedConfigResource {
   @VisibleForTesting
   @UsedAt(Project.PLUGIN_PULL_REPLICATION)
+  @SuppressWarnings("UnnecessaryAssignment")
   public static MergedConfigResource withBaseOnly(ConfigResource base) {
     MergedConfigResource mergedConfigResource = new MergedConfigResource();
+    // This assigns an @Inject field explicitly, which is intentional here.
+    // Suppress UnnecessaryAssignment as DI is bypassed on this code path.
     mergedConfigResource.baseConfigProvider = Providers.of(base);
     return mergedConfigResource;
   }