[opampsupervisor] Support resource detectors for service telemetry

[iblancasa]

Component(s)

cmd/opampsupervisor

Is your feature request related to a problem? Please describe.

The opamp supervisor self-observability telemetry doesn't use resource detectors, which means:

1. Environment variables don't work: OTEL_RESOURCE_ATTRIBUTES and OTEL_SERVICE_NAME are ignored.
2. Cloud metadata requires manual config: when running on AWS/GCP/Azure, you have to manually configure all the cloud attributes (region, account, instance type, etc.) instead of auto-detecting them.
3. Host information missing: basic stuff like host.id that could be auto-detected requires manual setup.

Similar to open-telemetry/opentelemetry-collector#14311

Describe the solution you'd like

Since this is something that is available as part of the go-sdk, I would like to see a detectors new field under .service.telemetry that allow enabling the detectores available in the go sdk.

Describe alternatives you've considered

No response

Additional context

No response

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[github-actions]

Pinging code owners for cmd/opampsupervisor: @evan-bradley @atoulme @tigrannajaryan. See Adding Labels via Comments if you do not have permissions to add labels yourself. For example, comment '/label priority:p2 -needs-triage' to set the priority and remove the needs-triage label.

[github-actions]

Pinging code owners:

• cmd/opampsupervisor: @evan-bradley @atoulme @tigrannajaryan

See Adding Labels via Comments if you do not have permissions to add labels yourself.