[DOC] Describe how to upgrade Logstash managed by package manager in case were installed not supported plugins#15317

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andsel wants to merge 2 commits intoelastic:mainfrom andsel:fix/doc_how_to_install_not_bundled_plugins_during_an_upgrade

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Commits on Sep 12, 2023

Documented how to re-install manually installed plugins not bundled with a release, during an upgrade package.
andsel
committed

Commits on Sep 19, 2023

Added callout action when upgrading Logstash installation on which were installed plugins not officially supported
andsel
committed