Datasource Metadata queries do not use the specified bulk time range

[chandrams]

Describe the bug
Datasource Metadata queries have measurement duration of 15 days and do not consider the specified bulk time range
Test failed with 503 http code and kruize pod was restarted with parallel requests.

How to reproduce it
Invoke the bulk API with a time range difference of 1 hour in start & end time with prometheus datasource, metadata queries fetch 15 days instead of using the bulk time range

curl -X POST http://kruize-openshift-tuning.apps.<server>/bulk -H 'Content-Type: application/json' -d '{"filter": {"exclude": {"namespace": [], "workload": [], "containers": [], "labels": {}}, "include": {"namespace": [], "workload": [], "containers": [], "labels": {}}}, "datasource": "prometheus-1", "time_range": {"start": "2025-01-08T12:30:00.000Z", "end": "2025-01-08T13:30:00.000Z"}}'

Expected behavior
Metadata queries should consider the bulk time range.

Relevant logs

2025-01-0904:02:20.375 INFO [pool-9-thread-1][DataSourceMetadataOperator.java(215)]-namespaceQuery: sum by (namespace) ( avg_over_time(kube_namespace_status_phase{namespace!='' }[15d]))
2025-01-0904:02:20.375 INFO [pool-9-thread-3][DataSourceMetadataOperator.java(301)]-filterBuilder: workload!=''
2025-01-0904:02:20.375 INFO [pool-9-thread-4][DataSourceMetadataOperator.java(215)]-namespaceQuery: sum by (namespace) ( avg_over_time(kube_namespace_status_phase{namespace!='' }[15d]))
2025-01-0904:02:20.375 INFO [pool-9-thread-3][DataSourceMetadataOperator.java(301)]-filterBuilder: container!=''
2025-01-0904:02:20.375 INFO [pool-9-thread-4][DataSourceMetadataOperator.java(216)]-workloadQuery: sum by (namespace, workload, workload_type) ( avg_over_time(namespace_workload_pod:kube_pod_owner:relabel{workload!='' }[15d]))  
2025-01-0904:02:20.375 INFO [pool-9-thread-3][DataSourceMetadataOperator.java(215)]-namespaceQuery: sum by (namespace) ( avg_over_time(kube_namespace_status_phase{namespace!='' }[15d]))

Environment:

• Kubernetes Cluster : openshift