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Removing the block manager v1. This is the initial piece of prefix-caching-centric design. In order to achieve prefix-caching-centric design, we need to simplify the code path so that we only use v2 block manager (which has much higher performance on prefix caching).

[Core] Add an environment variable which needs to be set explicitly to allow BlockSpaceManagerV1 (#9149)

Co-authored-by: Roger Wang <136131678+ywang96@users.noreply.github.com>

Signed-off-by: Muralidhar Andoorveedu <muralidhar.andoorveedu@centml.ai>
Signed-off-by: Murali Andoorveedu <muralidhar.andoorveedu@centml.ai>
Co-authored-by: DarkLight1337 <tlleungac@connect.ust.hk>

Co-authored-by: Nick Hill <nickhill@us.ibm.com>
Co-authored-by: rshaw@neuralmagic.com <rshaw@neuralmagic.com>
Co-authored-by: Robert Shaw <114415538+robertgshaw2-neuralmagic@users.noreply.github.com>
Co-authored-by: Simon Mo <simon.mo@hey.com>

Co-authored-by: Roger Wang <ywang@roblox.com>

Support pipeline-parallelism with Ray accelerated DAG.
Signed-off-by: Rui Qiao <ruisearch42@gmail.com>

Co-authored-by: simon-mo <simon.mo@hey.com>

Signed-off-by: Muralidhar Andoorveedu <muralidhar.andoorveedu@centml.ai>
Co-authored-by: Muralidhar Andoorveedu <muralidhar.andoorveedu@centml.ai>

Signed-off-by: Muralidhar Andoorveedu <muralidhar.andoorveedu@centml.ai>