fix(hubble): surface controller-runtime manager start failures

[slariviere]

Description

Wrap the controller-runtime manager's start call so that any returned error or an unexpected clean return is logged and triggers a hive shutdown instead of being silently discarded by the worker pool.

Related Issue

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Checklist

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Screenshots (if applicable) or Testing Completed

In my case, a port conflict was preventing the controller-runtime manager from starting:

ts=2026-06-02T13:35:23.949Z level=error caller=hubble/daemon_linux.go:86 msg="controller-runtime manager exited with error; node reconciler is no longer running" module=agent.control-plane.daemon error="failed to start metrics server: failed to create listener: listen tcp :18080: bind: address already in use" stacktrace="log/slog.(*Logger).Error\n\t/usr/local/go/src/log/slog/logger.go:229\ngithub.com/microsoft/retina/cmd/hubble.init.func4.1.1\n\t/go/src/github.com/microsoft/retina/cmd/hubble/daemon_linux.go:86\ngithub.com/cilium/workerpool.(*WorkerPool).run.func1\n\t/go/pkg/mod/github.com/cilium/workerpool@v1.4.0/workerpool.go:269"

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