Filter out "confirm_location" submissions from notifications

[timothyfroehlich]

Problem

"confirm_location" submissions are currently included in all notifications, but they're not very useful for users who want to know about actual pinball machine changes.

Expected Behavior

Filter out submissions with type "confirm_location" from:

• Initial notifications when adding cities/locations
• Ongoing notifications for watched targets
• All user-facing submission lists

Current Behavior

All submission types are included in notifications, including "confirm_location" which just indicates someone confirmed a location's details without adding/removing machines.

Implementation Notes

• Filter should be applied in the notification/submission fetching logic
• Keep "confirm_location" submissions in the database - just filter them from user-facing notifications
• May need to adjust submission counting logic to account for filtered submissions