Move RestClientReactiveConfig to use @ConfigMapping

[radcortez]

• Fixes Deprecation of quarkus.rest-client.disable-smart-produces #43748
• Undeprecates quarkus.rest-client.disable-smart-produces, due to Big Quarkus REST rename #39159
• Added Rest Client configuration references to docs

[github-actions]

🎊 PR Preview 7f5dc76 has been successfully built and deployed to https://quarkus-pr-main-43774-preview.surge.sh/version/main/guides/

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[quarkus-bot]

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[quarkus-bot]

Status for workflow Quarkus CI

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