Health endpoints should always be exposed for usage by Kubernetes probes

[tbrettschneider]

Currently the /health endpoints will only be exposed if the Prometheus exporter is enabled in the Helm chart configuration. If e.g. only the OTEL exporter is enabled the pods continuously fail due to failing startup, readiness, liveness probes as the /health endpoint is not available. As a temporary workaround the Prometheus exporter needs to be enabled.

Expectation:

The /health endpoint should always be available/exposed by default and its availability should not depend on an metrics exporter being enabled.