[8.16] Attack Discovery updates

[benironside]

Fixes #6003 — updates the ESS Attack Discovery doc to reflect updates (added RBAC, changed the number of alerts it can review and how to adjust that setting), and refresh screenshots.

Previews: Attack Discovery (ESS)

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[mergify]

This pull request is now in conflicts. Could you fix it @benironside? 🙏
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 6003-AD-updates-8.16 upstream/6003-AD-updates-8.16
git merge upstream/main
git push upstream 6003-AD-updates-8.16

[Charelzard]

https://docs.google.com/document/d/1VOJ0X-U6_JH2XNDPUgRo36Z-AqgioOzlsKRKXcUFy2s/edit?tab=t.0

1. We should still call out RBAC settings for Attack Discovery.

2. I know we spoke about this previously but the first photo after the video does not show the new screen shot:

[natasha-moore-elastic]

A couple of questions, otherwise looks good!

[mergify]

This pull request is now in conflicts. Could you fix it @benironside? 🙏
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 6003-AD-updates-8.16 upstream/6003-AD-updates-8.16
git merge upstream/main
git push upstream 6003-AD-updates-8.16

[benironside]

Closing this and continuing the work in #6114