Enable PURGE_VIEW_METADATA_ON_DROP, but not work

### Describe the bug Enable PURGE_VIEW_METADATA_ON_DROP and DROP_WITH_PURGE_ENABLED drop metadata task created to pg db, however, the task was not submitted to the taskExecutor. see dropView https://github.com/apache/polaris/blob/apache-polaris-1.5.0/runtime/service/src/main/java/org/apache/polaris/service/catalog/iceberg/IcebergCatalog.java#L877 and dropTable submit task to taskExecutor https://github.com/apache/polaris/blob/apache-polaris-1.5.0/runtime/service/src/main/java/org/apache/polaris/service/catalog/iceberg/IcebergCatalog.java#L392 ### To Reproduce k8s image: docker.io/apache/polaris:1.5.0 key config: ```properties application.properties: |- polaris.features."DROP_WITH_PURGE_ENABLED"=true polaris.features."PURGE_VIEW_METADATA_ON_DROP"=true ``` ### Actual Behavior drop view metadata task created, but not execute ### Expected Behavior correctly delete metadata ### Additional context _No response_ ### System information _No response_