WT-14147 Fix the eviction updates trigger config log to reflect correct metric

[mariammojid]

When trying to check the eviction_updates_trigger for invalid configuration, the log incorrectly states we set the default value to half of the eviction_updates_trigger value instead of the eviction_dirty_trigger. Also, found a similar error in the same function inevict_conn.c, the error message should say setting to 50% of eviction_dirty_target not eviction_updates_target.

Solution: fixed inconsistencies in __evict_validate_config config log to reflect the correct metrics and fixed pattern matching error in test_config12.py.

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[Sean04]

lgtm

[Sean04]

lgtm

[bzm-jas]

LGTM!