feat: query hot flowBuffer and cold S3 Parquet for raw flows

[jpinsonneau]

Summary

• Console config: flowBuffer (FLP Service URL) and s3 / consolePlugin.s3 for cold Parquet (legacy s3Query still accepted).
• Backend: FLP client to /api/flowbuffer/flows (port 9200) and S3 Hive Parquet querier for GetFlows / export.
• Frontend: buffer-only mode when Loki is off; query warnings for partial/hot-tier results; Overview continues to use Prometheus.

Hub PR (operator): netobserv/netobserv-operator#2845

Test plan

• go test ./pkg/flp/... ./pkg/s3query/... ./pkg/handler/...
• Unit / frontend tests for capabilities and query options
• With operator Kind setup: GetFlows via FLP buffer and S3; buffer-only UI; Overview metrics from Prom
• Confirm ConfigMap emits s3 (not only legacy s3Query)

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