feat(inspection): add NodeNameDiscoveryTask for k8snode and k8scontainer log parsers

[kyasbal]

Summary

Compute Engine API log parser (googlecloudlogcomputeapiaudit) and Serial Port log parser (googlecloudlogserialport) depend on the node name inventory (NodeNameInventoryTask) to query logs for relevant nodes/instances.

Previously, only Kubernetes audit logs (commonlogk8saudit_impl.NodeNameDiscoveryTask) were capable of discovering node names. This PR adds new NodeNameDiscoveryTask implementations to googlecloudlogk8snode and googlecloudlogk8scontainer so that node names can also be discovered from Node logs and Container log labels, ensuring complete node name coverage even when audit logs are absent.

Key Changes

• pkg/task/inspection/googlecloudlogk8snode:
  • Defined NodeNameDiscoveryTaskID and implemented NodeNameDiscoveryTask to extract node names from K8sNodeLogCommonFieldSet.NodeName.
  • Added NodeNameDiscoveryTaskID.Ref() to TailTask dependencies to ensure the discovery task is automatically included in the inspection DAG when node logs are inspected.
  • Added unit tests (nodename_discovery_task_test.go).
• pkg/task/inspection/googlecloudlogk8scontainer:
  • Defined NodeNameDiscoveryTaskID and implemented NodeNameDiscoveryTask to extract node names from GCPContainerLogNodeNameLabelFieldSet.NodeName (labels."compute.googleapis.com/resource_name").
  • Added NodeNameDiscoveryTaskID.Ref() to TailTask dependencies to ensure the discovery task is automatically included in the inspection DAG when container logs are inspected.
  • Added unit tests (nodename_discovery_task_test.go).
• pkg/task/inspection/googlecloudlogcomputeapiaudit & googlecloudlogserialport:
  • Updated dry-run query placeholder comments from -- instance name filters to be determined after audit log query to -- instance name filters to be determined after node name discovery.

Verification

• Added unit tests for new NodeNameDiscoveryTask implementations:
  • go test ./pkg/task/inspection/googlecloudlogk8snode/impl -run TestNodeNameDiscoveryTask -> PASS
  • go test ./pkg/task/inspection/googlecloudlogk8scontainer/impl -run TestNodeNameDiscoveryTask -> PASS
• Verified dry-run query generation tests:
  • go test ./pkg/task/inspection/googlecloudlogcomputeapiaudit/impl -run TestGenerateComputeAPIQuery -> PASS
  • go test ./pkg/task/inspection/googlecloudlogserialport/impl -run TestGenerateSerialPortQuery -> PASS
• Ran full backend regression tests and style checks:
  • make build-go -> PASS
  • make test-go -> PASS
  • make pre-commit -> PASS (no linter/formatting issues)

[gemini-code-assist]

Code Review

This pull request introduces node name discovery tasks for both Kubernetes container logs and node logs to extract node names and register them to the node name inventory. It also updates the query generation logic for Compute API and Serial Port logs to indicate that instance name filters are determined after node name discovery. I have no feedback to provide as there are no review comments.