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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).

Co-authored-by: Brendan Wong <bjwpokemon@gmail.com>

Signed-off-by: Thomas Parnell <tpa@zurich.ibm.com>

Co-authored-by: Antoni Baum <antoni.baum@protonmail.com>

[CI/Test] improve robustness of test by replacing del with context manager (vllm_runner) (#5357)

Since #4335 was merged, I've noticed that the definition of ServerRunner in the tests is the same as in the test for OpenAI API. I have moved the class to the test utilities to avoid code duplication. (Although it only has been repeated twice so far, I will add another similar test suite in #4200 which would duplicate the code a third time)

Also, I have moved the test utilities file (test_utils.py) to under the test directory (tests/utils.py), since none of its code is actually used in the main package. Note that I have added __init__.py to each test subpackage and updated the ray.init() call in the test utilities file in order to relative import tests/utils.py.