[Bug] 改变gremlin-server.yaml里empty-sample.groovy为example.groovy后start-hugegraph出现报错Could not create GremlinScriptEngine for gremlin-groovy

### 主要报错

```
[ERROR] o.a.t.g.j.DefaultGremlinScriptEngineManager - Could not create GremlinScriptEngine for gremlin-groovy**
```

### Bug Type (问题类型)

server status (启动/运行异常)

### Before submit

- [x] 我已经确认现有的 [Issues](https://github.com/apache/hugegraph/issues) 与 [FAQ](https://hugegraph.apache.org/docs/guides/faq/) 中没有相同 / 重复问题 (I have confirmed and searched that there are no similar problems in the historical issue and documents)

### Environment (环境信息)

- Server Version: 1.5.0 (Apache Release Version)
- Backend: RocksDB x nodes, HDD or SSD
- OS: Ubuntu 20.04.6 LTS

### Expected & Actual behavior (期望与实际表现)

打算解决以下issue时发现复现情况2时出现问题：
**相关issue** [原始issue](https://github.com/apache/incubator-hugegraph/issues/2310)

原始的`gremlin.server.yaml` 中的` org.apache.tinkerpop.gremlin.jsr223.ScriptFileGremlinPlugin:` 属性，直接运行` ./start-hugegraph.sh `没有报错
```
org.apache.tinkerpop.gremlin.jsr223.ScriptFileGremlinPlugin: {
files: [scripts/empty-sample.groovy]
}
```

上述属性修改为`scripts/example.groovy`
```
org.apache.tinkerpop.gremlin.jsr223.ScriptFileGremlinPlugin: {
files: [scripts/example.groovy]
}
```

后出现以下报错 (截取主要片段

```
**2025-06-05 22:14:09 [gremlin-server-exec-1] [WARN] o.a.h.c.OptionSpace - Already registered option holder: rocksdb (class org.apache.hugegraph.backend.store.rocksdb.RocksDBOptions)
2025-06-05 22:14:09 [gremlin-server-exec-1] [ERROR] o.a.t.g.j.DefaultGremlinScriptEngineManager - Could not create GremlinScriptEngine for gremlin-groovy**

**Caused by: javax.script.ScriptException: javax.script.ScriptException: org.apache.hugegraph.backend.BackendException: Exists BackendStoreProvider: rocksdb (class org.apache.hugegraph.backend.store.rocksdb.RocksDBStoreProvider)**

**Caused by: javax.script.ScriptException: org.apache.hugegraph.backend.BackendException: Exists BackendStoreProvider: rocksdb (class org.apache.hugegraph.backend.store.rocksdb.RocksDBStoreProvider)**

**Caused by: org.apache.hugegraph.backend.BackendException: Exists BackendStoreProvider: rocksdb (class org.apache.hugegraph.backend.store.rocksdb.RocksDBStoreProvider)**

**2025-06-05 22:14:09 [main] [WARN] o.a.t.g.s.u.ServerGremlinExecutor - Could not initialize gremlin-groovy GremlinScriptEngine as init script could not be evaluated**

**Caused by: java.lang.IllegalArgumentException: gremlin-groovy is not an available GremlinScriptEngine
at org.apache.tinkerpop.gremlin.jsr223.CachedGremlinScriptEngineManager.registerLookUpInfo(CachedGremlinScriptEngineManager.java:95) ~[gremlin-core-3.5.1.jar:3.5.1]**

```

具体的`logfile`如下

[hugegraph-server.log](https://github.com/user-attachments/files/20612933/hugegraph-server.log)