Currently before calling __wti_blkcache_remove, we always perform a check for whether the given block had been configured, so we then move forward with the remove process. For example:

    /* Evict the freed block from the block cache */
    if (blkcache->type != WT_BLKCACHE_UNCONFIGURED)
        __wti_blkcache_remove(session, addr, addr_size);

Since this is a necessary check before calling __wti_blkcache_remove, it'd be nice if we can move this check inside __wti_blkcache_remove, following similar logic to that in __wt_blkcache_destroy.