[8.x] [8.18][Serverless] Alert status information re-added to flyout (backport #6415) (#6426)

* [8.18][Serverless] Alert status information re-added to flyout (#6415)

(cherry picked from commit 32cecfd)

# Conflicts:
#	docs/serverless/alerts/view-alert-details.asciidoc
#	docs/serverless/images/view-alert-details/-detections-about-section-rp.png

* Delete docs/serverless directory and its contents

---------

Co-authored-by: Nastasha Solomon <[email protected]>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: 3 people

docs/detections/alerts-view-details.asciidoc

@@ -94,6 +94,8 @@ The About section has the following information:
 +
 NOTE: The event renderer only displays if an event renderer exists for the alert type. Fields are interactive; hover over them to access the available actions.
 
+* **Last alert status change**: Shows the last time the alert's status was changed, along with the user who changed it.
+
 [discrete]
 [[investigation-section]]
 == Investigation