Disable observability dev services at test time

[brunobat]

Disable automatic start of the Grafana lgtm at test time.
This has started after #54276

Impact

Low because it only affects tests and I'm not aware of users using this functionality.

Why?

Only extension specific tests are using this functionality but because the dev service starts automatically with quarkus-opentelemetry, this feature extends build time and uses more resources without need.

Other changes

Updated the docs to make them consistent with the automatic start of the Grafana LGTM dev service when quarkus-opentelemetry is present.

[geoand]

Fine with me, but I'll let @alesj have the final say

[brunobat]

Actually, this isn't a breaking change because Martin's PR is part of 3.38 and has not been released yet.

[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit 77bf2eb.

✅ 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.

Warning

There are other workflow runs running, you probably need to wait for their status before merging.

You can consult the Develocity build scans.

[quarkus-bot]

Status for workflow Quarkus Documentation CI

This is the status report for running Quarkus Documentation CI on commit 77bf2eb.

✅ 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.

[github-actions]

🎊 PR Preview 02f04e3 has been successfully built and deployed to https://quarkus-pr-main-54952-preview.surge.sh/version/main/guides/

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