Add BGP/BFD session health tab to Network Health page

[jpinsonneau]

Summary

• Adds a third BGP context tab on the Health page (alongside NetObserv and Platform) to monitor BGP and BFD session alerts sourced from frrk8s_* Prometheus metrics
• Displays alerts grouped globally (cluster-wide) and per-peer (by BGP peer IP), with summary cards showing critical/warning/info counts and firing/pending/silenced states
• Adds ASN enrichment support: bgpEnrichment feature flag, SrcASN/DstASN flow fields, ASN columns/filters/grouping in topology scopes, and common ASN filter with endpoint category fallback
• Includes Go mock data for standalone development

Dependencies

• Builds on top of PR NETOBSERV-2572: OVN health tab and extensible context tabs #1699 (Platform/OVN health tab)
• Requires bgp-cloud-connector PrometheusRules deployed on the cluster (BGPSessionHealth / BFDSessionHealth groups with frrk8s_* metrics)
• Companion operator-side config changes needed in netobserv-operator (static-frontend-config.yaml)

Test plan

• Verify BGP tab appears when BGP PrometheusRules are deployed and frrk8s_* metrics exist
• Verify BGP tab is hidden when no BGP rules are found (graceful fallback)
• Verify Global/Peers subtab navigation and alert display
• Verify summary cards show correct severity counts
• Verify standalone mock mode shows BGP alerts
• Verify ASN filter works as common (non-directional) and src/dst variants
• Verify ASN grouping within topology scopes (host, namespace, owner, resource)

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PR needs rebase.

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