Beyla does not stop execution if only NetO11y or AppO11y component fails.

[mariomac]

In Beyla 1.6, when either NetO11y or AppO11y couldn't initialize, Beyla stopped.

Example, setting a wrong BEYLA_NETWORK_AGENT_IP value:

time=2025-01-10T15:38:26.461Z level=INFO msg="Grafana Beyla" Version=cc5a468f Revision=cc5a468f "OpenTelemetry SDK Version"=1.24.0
time=2025-01-10T15:38:26.462Z level=INFO msg="starting PProf HTTP listener" port=6060
time=2025-01-10T15:38:26.462Z level=INFO msg="starting Beyla in Network metrics mode"
time=2025-01-10T15:38:26.462Z level=INFO msg="initializing Flows agent" component=agent.Flows
time=2025-01-10T15:38:26.462Z level=ERROR msg="can't start network metrics capture" error="acquiring Agent IP: can't parse provided IP alsdkfjlk***ads!!"

At some point in Beyla 1.7, this is not the behavior anymore and Beyla keeps running without showing any error. PR #1509 restores the error messages but the failure would anyway become unnoticed for most users unless they see the logs of all their Beyla isntances.