[BugFix] pk compaction update cache entry size (StarRocks#28332)

Signed-off-by: liuyufei9527 <[email protected]>

be/src/storage/tablet_updates.cpp

@@ -1850,6 +1850,7 @@ void TabletUpdates::_apply_compaction_commit(const EditVersionInfo& version_info
     index_entry->update_expire_time(MonotonicMillis() + manager->get_cache_expire_ms());
     auto& index = index_entry->value();
     auto st = index.load(&_tablet);
+    manager->index_cache().update_object_size(index_entry, index.memory_usage());
     // `enable_persistent_index` of tablet maybe change by alter, we should get `enable_persistent_index` from index to
     // avoid inconsistency between persistent index file and PersistentIndexMeta
     bool enable_persistent_index = index.enable_persistent_index();