Pull request #4795: hash: return cache size from LruCache remove so new size check...

Pull request #4795: hash: return cache size from LruCache remove so new size check can be atomic.

Merge in SNORT/snort3 from ~STECHEW/snort3:ai_new_counters to master

Squashed commit of the following:

commit a40da129af5b3a3af0c4955dfe4abca2838f2243
Author: Steve Chew <stechew@cisco.com>
Date:   Mon Jul 7 22:49:39 2025 -0400

    hash: Ensure that find_else_create functions set is_new field in all cases.

commit 41bad9d633ea8fba455baabd8d778b3a34f32fb2
Author: Steve Chew <stechew@cisco.com>
Date:   Wed Jul 2 23:06:27 2025 -0400

    hash: return cache size from remove so new size check can be atomic.