Related to WT-14646

Currently, WiredTiger's eviction system may select pages with a small number of updates for eviction even when the system is not under significant cache pressure. This can lead to inefficient eviction operations for pages with minimal modifications.

We can enhance the eviction selection algorithm to skip pages with fewer than 15 updates when the cache pressure is low to allow these lightly modified pages to accumulate more updates before being queued for eviction.