8.18.0 Release notes

[nastasha-solomon]

Description

This PR addresses #6399 by providing release notes for 8.18.0. Release notes for 9.0.0 are at: elastic/docs-content#1014

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8.18 release notes

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[mergify]

This pull request is now in conflicts. Could you fix it @nastasha-solomon? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b rn-8.18.0 upstream/rn-8.18.0
git merge upstream/8.x
git push upstream rn-8.18.0

[approksiu]

@nastasha-solomon I am missing the manual runs ability to execute rule actions item cc @yctercero

[nicpenning]

Typo

[banderror]

Thanks @nastasha-solomon, Rule Management notes LGTM 👍

[benironside]

🔥 🔥 🔥 🚀 🚀 🚀 😎 😎 😎