Rolling restart Admin API

[kbatuigas]

This pull request updates the Rolling Restart and Update Redpanda pages to include new Admin API endpoints. Related Admin API Reference update: #1019

Documentation updates:

• modules/get-started/pages/whats-new.adoc: Added new health probes pre_restart_probe and post_restart_probe to What's New.
• modules/upgrade/partials/rolling-upgrades/enable-maintenance-mode.adoc: Added example usage and output for the pre_restart_probe endpoint to perform additional checks before restarting a broker.
• modules/upgrade/partials/rolling-upgrades/post-upgrade-tasks.adoc: Added example usage and output for the post_restart_probe endpoint to check broker workload recovery after a restart.

Description

Resolves https://redpandadata.atlassian.net/browse/
Review deadline: 27 March

Page previews

What's New
Perform a Rolling Restart
Upgrade Redpanda in Linux

Checks

• New feature
• Content gap
• Support Follow-up
• Small fix (typos, links, copyedits, etc)

[hyperlint-ai]

PR Change Summary

Updated the Rolling Restart and Update Redpanda documentation to include new Admin API endpoints for health probes.

• Added new health probes for broker restarts and upgrades to the What's New page.
• Included example usage for the pre_restart_probe endpoint in the maintenance mode documentation.
• Added example usage for the post_restart_probe endpoint in the post-upgrade tasks documentation.

Modified Files

• modules/get-started/pages/whats-new.adoc
• modules/upgrade/partials/rolling-upgrades/enable-maintenance-mode.adoc
• modules/upgrade/partials/rolling-upgrades/post-upgrade-tasks.adoc

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[mattschumpert]

This is really nice @bashtanov ! Seems this will help a lot in building a smoother automated restart/upgrade automation @chrisseto @mmaslankaprv