Draft: Integration branch for current/next hotfix

Purpose

• frequently rebased on master
• used as parking lot for fixes that will be picked into one of the next hotfix branches
• will never be merged

Preview

• https://frontend-core-integration-master.k3s.os2.oxui.de/

Backup branch

• https://gitlab.open-xchange.com/frontend/core/-/tree/integration/master

TODO Frank

• SCR for "breaking changes"