Disable logger exporter metrics if metrics disabled

[brunobat]

Also, clarify documentation of properties enabling OTel logs and metrics

[quarkus-bot]

/cc @radcortez (opentelemetry)

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[rsvoboda]

I just did quick check through the text, I will try the functionality tmr.

[quarkus-bot]

Status for workflow Quarkus Documentation CI

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[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit a6a7d03.

✅ The latest workflow run for the pull request has completed successfully.

It should be safe to merge provided you have a look at the other checks in the summary.

You can consult the Develocity build scans.