Otel metrics part2 - Metrics documentation

[brunobat]

Closes #39033
It's a continuation of #39032 focused on usability and documentation.

It is now possible to configure the connections for traces and metrics with the same properties, along with the previous signal specific ones.

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[quarkus-bot]

/cc @radcortez (opentelemetry)

[brunobat]

@luneo7 and @melloware if you want to give your review on the new documentation it would be great.

[quarkus-bot]

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[melloware]

LGTM Bruno. Excited about all these improvements.

[quarkus-bot]

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

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