XWIKI-22999: Activity stream should use list semantics #4715
      
        
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Jira URL
https://jira.xwiki.org/browse/XWIKI-22999
Changes
Description
Clarifications
Screenshots & Video
Before this PR:


After this PR:
Executed Tests
Built the changes with
mvn clean install -f xwiki-platform-core/xwiki-platform-notifications/xwiki-platform-notifications-notifiers/xwiki-platform-notifications-notifiers-api.Tested
mvn clean install -f xwiki-platform-distribution/xwiki-platform-distribution-flavor/xwiki-platform-distribution-flavor-test/xwiki-platform-distribution-flavor-test-webstandardswith the HTML5 validator only. Somehow the tests failed on another page, for what seems like unrelated reasons. I could reproduce the errors before the changes and not anymore after the changes so it seems like it's an improvement. Note that I could not get-Dpatternto work on the build, and despite removing the other validators from my tests, it still took 35mins to run once...Expected merging strategy