Chat with groups + AI chat UI and logic overhaul #18059

Job	Run time
Markdown	6s
Modernizer	1m 7s
CHANGELOG.md - only unreleased touched	17s
Checkstyle	2m 0s
Database tests	2m 27s
OpenRewrite	2m 19s
Unit tests	6m 35s
CHANGELOG.md	8s
Code coverage	34s
Validate Gradle Wrapper	6s
GUI tests	1m 35s
Find merge conflicts	5s
Source branch is other than "main"	1s
	17m 20s

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