kmesh: components: Implement Observability Control Panel

[itvi-1234]

Description

Implements the Monitoring & Observability Control Panel for the Kmesh Headlamp plugin.
This provides a UI for toggling observability features and setting log levels on individual Kmesh daemon pods.

Key Changes

• Observability Panel Component: Created ObservabilityPanel in src/components/daemon/ObservabilityPanel.tsx.
• Pod Selector: Added a dropdown (matching Headlamp's namespace selector style) to explicitly target individual kmesh-daemon pods when multiple nodes exist.
• Toggles: Implemented MUI Switch components to toggle Monitoring, Access Logs, Workload Metrics, Connection Metrics, and XDP Authz Offloading.
• Log Management: Added dropdowns and logic to fetch available loggers and set specific log levels.
• Routing: Registered the new component and a sidebar entry for /kmesh/observability in kmeshRoutes.ts and index.tsx.