feat(otel): Add OTLP logs integration test framework

[miconeilaws]

Add integration tests for OTEL Container Insights log pipelines alongside the existing metrics tests.

Components:

• util/otelmetrics/expectations.go: Shared attribute expectations (NodeResourceAttrs, PodResourceAttrs, AppLogResourceAttrs, etc.) reusable by both metrics and logs tests - will update the metrics tests the share these in a follow-up
• util/otellogs/: CW Logs Insights client with query cache and OTLP JSON parser for the stored log structure
• test/otel/standard/logs_*_test.go: Integration tests validating resource attributes, scope attributes, cross-telemetry consistency

Tests verify that logs share the same resource attributes as metrics (host logs match node_exporter, app logs match cadvisor), ensuring cross-signal correlation works correctly.

All green:

  --- PASS: TestAppLogsExist (3.02s)
  --- PASS: TestAppLogsResourceAttrs (0.00s)
      --- PASS: TestAppLogsResourceAttrs/k8s.cluster.name
      --- PASS: TestAppLogsResourceAttrs/k8s.node.name
      --- PASS: TestAppLogsResourceAttrs/k8s.node.uid
      --- PASS: TestAppLogsResourceAttrs/host.id
      --- PASS: TestAppLogsResourceAttrs/host.type
      --- PASS: TestAppLogsResourceAttrs/host.name
      --- PASS: TestAppLogsResourceAttrs/host.image.id
      --- PASS: TestAppLogsResourceAttrs/cloud.provider
      --- PASS: TestAppLogsResourceAttrs/cloud.platform
      --- PASS: TestAppLogsResourceAttrs/cloud.region
      --- PASS: TestAppLogsResourceAttrs/cloud.availability_zone
      --- PASS: TestAppLogsResourceAttrs/cloud.account.id
      --- PASS: TestAppLogsResourceAttrs/cloud.resource_id
      --- PASS: TestAppLogsResourceAttrs/k8s.pod.name
      --- PASS: TestAppLogsResourceAttrs/k8s.namespace.name
      --- PASS: TestAppLogsResourceAttrs/k8s.pod.uid
      --- PASS: TestAppLogsResourceAttrs/k8s.container.name
      --- PASS: TestAppLogsResourceAttrs/k8s.workload.name
      --- PASS: TestAppLogsResourceAttrs/k8s.workload.type
      --- PASS: TestAppLogsResourceAttrs/service.name
  --- PASS: TestAppLogsScopeAttrs (0.00s)
      --- PASS: TestAppLogsScopeAttrs/cloudwatch.source
      --- PASS: TestAppLogsScopeAttrs/cloudwatch.solution
      --- PASS: TestAppLogsScopeAttrs/cloudwatch.pipeline
  --- PASS: TestAppLogsClusterIdentity (0.00s)
  --- PASS: TestAppLogsCloudProvider (0.00s)
  --- PASS: TestAppLogsHostType (0.00s)
  --- PASS: TestAppLogsBody (0.00s)
  --- PASS: TestAppLogsRecordAttrs (0.00s)
      --- PASS: TestAppLogsRecordAttrs/log.iostream
      --- PASS: TestAppLogsRecordAttrs/log.file.path
  --- PASS: TestAppLogsWorkloadDerivation (0.00s)
  --- PASS: TestCrossTelemetryHostID (0.69s)
  --- PASS: TestCrossTelemetryCloudResourceID (0.00s)
  PASS
  ok    4.280s