feat: S3 Parquet exporter, flowBuffer, and console cold/hot raw flows

[jpinsonneau]

Summary

Epic hub for S3 / Hive Parquet / flowBuffer raw-flow storage and query (Loki-optional path).

This PR (operator):

• FlowCollector API: processors.flowBuffer, S3 exporters (Hive Parquet schema v1), consolePlugin.s3.enable
• FLP reconcile: encode.s3 + write.flowBuffer, query port 9200, peer discovery RBAC (netobserv-flp-peer-query), NetworkPolicy
• Console plugin ConfigMap: flowBuffer URL + s3 datasource (not s3Query)
• Docs: docs/S3_Parquet.md, Architecture / FAQ / NetworkPolicy updates

Sibling draft PRs

Component	PR
flowlogs-pipeline	netobserv/flowlogs-pipeline#1298
console plugin	netobserv/netobserv-web-console#1605
CLI	netobserv/netobserv-cli#542

Skipped: netobserv-ebpf-agent — only go.mod / vendor bump of FLP (no agent code); no agent PR. For Kind CLI captures that need embedded FLP S3 Parquet, use image quay.io/jpinsonn/netobserv-ebpf-agent:s3-flowbuffer (see CLI PR for override env and full test steps).

Test plan

• Unit: make test (FLP pipeline builder, reconciler, webhook validation)
• CRD/bundle: make update-bundle already reflected in this PR’s manifests
• Kind e2e below

Kind testing — Operator + console + FLP

1. Kind cluster; install MinIO and cert-manager.
2. Images (or build from PR branches):
   • quay.io/jpinsonn/{flowlogs-pipeline,network-observability-operator,network-observability-console-plugin}:s3-flowbuffer
3. FlowCollector:
   • Loki off
   • processors.flowBuffer on
   • S3 exporter → MinIO (Hive Parquet)
   • consolePlugin.s3.enable
   • Standalone console (or plugin) as preferred
4. Verify:
   • Parquet objects in MinIO under Hive layout (cluster_id=.../)
   • Console GetFlows via FLP buffer and S3
   • Buffer-only mode (no Loki/S3 cold path as configured)
   • Overview still uses Prometheus

Kind testing — CLI

Full CLI Kind plan (custom agent/collector images, S3 env, MinIO verify) lives in the CLI PR. Agent artifact until/unless a separate agent PR lands: quay.io/jpinsonn/netobserv-ebpf-agent:s3-flowbuffer.

Notes

• Cross-repo contracts: port 9200, /api/flowbuffer/flows, consolePlugin.s3, schema v1 Hive Parquet, CLI default json,sqlite.
• Fork remotes are under jpinsonneau (GitHub user); Quay tags in the Kind plan use jpinsonn as in the local image naming convention.

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PR needs rebase.

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