fix: multi-way list entry resolution (#12617)

Fixes brought forward from https://github.com/minio/minio/pull/12605

Fixes resolution when an object is in prefix of another and one zone returns the directory and another the object.

Fixes resolution on single entries that arrive first, so resolution doesn't depend on order.

cmd/metacache-server-pool.go

@@ -182,7 +182,11 @@ func (z *erasureServerPools) listPath(ctx context.Context, o listPathOptions) (e
 
 				// Resolve non-trivial conflicts
 				entries.deduplicate(func(existing, other *metaCacheEntry) (replace bool) {
-					if existing.isDir() {
+					// Pick object over directory
+					if existing.isDir() && !other.isDir() {
+						return true
+					}
+					if !existing.isDir() && other.isDir() {
 						return false
 					}
 					eFIV, err := existing.fileInfo(o.Bucket)