Mattermost 10.7: Important upgrade notes

@denisra @mbruemmer Below is a note of important upgrade notes in our upcoming release.

Mattermost v10.7 (GitLab 18.0 - May, 2025)

• Added new column BannerInfo in Channels table for storing metadata for an upcoming licensed feature. The migration is fully backwards-compatible, non-locking, and zero downtime is possible.
• Added support for cursor-based pagination on the property architecture tables, including SQL migration to create indices. The migration is fully backwards-compatible, non-locking, and zero downtime is possible.