Consolidate snoozing commponents

What does this MR do and why?

This consolidates the snoozing functionality into a single component that handles snoozing and un-snoozing to-do items. This ensures the logic is better encapsulated.

This also fixes a bug where todo counts would not update after snoozing a to-do item.

References

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MR acceptance checklist

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Screenshots or screen recordings

counter_sync

How to set up and validate locally

1. Enable the todos_snoozing feature flag: http://gdk.test:3000/rails/features/todos_snoozing / https://gdk.test:3443/rails/features/todos_snoozing.
2. Navigate to the todos dashboard: https://gdk.test:3443/dashboard/todos.
   • When snoozing a to-do, the counter in the To Do tab should get updated.

Related to #17712