Deprecate the logging-gelf extension

[loicmathieu]

Deprecate the Logging GELF extension and impact the centralized logging guide with documented replacements.

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Status for workflow Quarkus Documentation CI

This is the status report for running Quarkus Documentation CI on commit 953e6b9.

✅ 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.

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[brunobat]

CC @tqvarnst