For VSWA scheme, we do not want `kv_cache_cnonfig.max_token` to control
and cap the maximum memory of a block pool because block pool size are
not identical amongst different window sizes. This MR omits the effect
of `kv_cache_config.max_tokens` under `kvCacheManager.cpp` to allow the
setting of block pool size to rely on the window size to share ratio
and the total gpu memory analyzed and fed to the kv cache manager.
Only skipping for VSWA scheme, no extra coverage was added.
Signed-off-by: eopXD <yuehtingc@nvidia.com>
