Kibana 8.19.23 release notes

[florent-leborgne]

Curate and publish the Kibana 8.19.23 release notes.

• Docs release issue: https://github.com/elastic/dev/issues/3636
• Kibana PR: [DOCS] Add Kibana 8.19.23 release notes kibana#294698

To-do

• Draft the release notes
• Open the Kibana PR against 8.19
• Add the release notes PR to the docs release issue
• Merge the Kibana release notes PR

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