[Helm chart] Allow otelExporterOtlpEndpoint value to contain Release/Values references

[calohmn]

When deploying the ditto Helm chart as part of the IoT Packages cloud2edge chart, it would be useful to provide combined tracing support for Ditto and Hono. The straightforward thing to do for this, would be enabling tracing support in the Hono chart, and referencing the corresponding OTLP endpoint in the Ditto tracing configuration.
This would mean setting ditto.global.tracing.otelExporterOtlpEndpoint to http://c2e-jaeger-collector:4317 for example. But this only works if the used release name when deploying the cloud2edge chart is indeed c2e.

To support arbitrary release names, http://{{ .Release.Name }}-jaeger-collector:4317 would have to be used as otelExporterOtlpEndpoint value.

In order for this to work, the ditto Helm chart would just need to use the tpl function in the place where otelExporterOtlpEndpoint gets used. This is a feature request for doing so.