Enable wiki page subscription notifications for content edits

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Proposal

After testing the new wiki page subscription feature introduced in GitLab 18.3, we've discovered that subscribers are not receiving notifications when wiki page content is edited. Notifications are only sent for comments added to wiki pages, not for actual content changes.

Wiki Enhancement: https://about.gitlab.com/releases/2025/08/21/gitlab-18-3-released/#enhancements-to-wiki-functionality

Expected vs Actual

• Expected: Notifications for both content edits and comments
• Actual: Only comment notifications work

Additional Context

• This issue affects the core value proposition of the wiki subscription feature
• Teams expecting to be notified of documentation changes may miss important updates
• Comment notifications work perfectly, indicating the subscription mechanism itself is functional

Business Impact

• Customer Experience: Users may lose trust in the notification system
• Documentation Workflow: Teams cannot rely on subscriptions for wiki change awareness
• Feature Adoption: Limits the usefulness of the new wiki subscription feature

Use Case Details

• Teams need to track documentation changes to stay informed about updates
• Current limitation reduces the value of the subscription feature
• Content change notifications would improve collaboration on living documentation