WT-14843 introduced statistics to track the number clean/dirty/updated pages seen by eviction and the number of each type queued for eviction.

These statistics for clean pages aren't quite right, as they treat clean pages as pages that aren't dirty and don't have updates. But clean and "has updates" are not mutually exclusive. We can have a clean page with updates. This typically happens when a dirty page is written by checkpoint. 

We should fix the way these statistics are computed:

• cache_eviction_pages_seen_clean
• cache_eviction_pages_seen_dirty
• cache_eviction_pages_seen_updates
• cache_eviction_pages_queued_clean
• cache_eviction_pages_queued_dirty
• cache_eviction_pages_queued_updates