ee677a6feb
### Why are the changes needed?
To fix NPE.
Before, we use below method to get `metadataManager`.
```
private def metadataManager = KyuubiServer.kyuubiServer.backendService
.sessionManager.asInstanceOf[KyuubiSessionManager].metadataManager
```
But before the kyuubi server fully restarted, the `KyuubiServer.kyuubiServer` is null and might throw NPE during batch recovery phase.
For example:
```
:2025-04-23 14:06:24.040 ERROR [KyuubiSessionManager-exec-pool: Thread-231] org.apache.kyuubi.engine.KubernetesApplicationOperation: Failed to get application by label: kyuubi-unique-tag=95116703-4240-4cc1-9886-ccae3a2ac879, due to Cannot invoke "org.apache.kyuubi.server.KyuubiServer.backendService()" because the return value of "org.apache.kyuubi.server.KyuubiServer$.kyuubiServer()" is null
```
### How was this patch tested?
Existing GA.
### Was this patch authored or co-authored using generative AI tooling?
No.
Closes #7041 from turboFei/fix_NPE.
Closes #7041
064d88707 [Wang, Fei] Fix NPE
Authored-by: Wang, Fei <fwang12@ebay.com>
Signed-off-by: Wang, Fei <fwang12@ebay.com>
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