[Bugfix] Fix Mamba MTP prefix-cache drop condition - #12
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`find_longest_cache_hit` returns `(computed_blocks, hit_length)` since vllm-project#46384 ("[2/N][Core] support partial prefix cache hit for hybrid model"), where `computed_blocks` is a tuple with one block list per KV cache group. `test_mamba_possible_cached_prefix_with_eagle_drop` indexed only `[0]`, so it asserted against the tuple of groups rather than group 0's block list, and failed with `assert 1 == 2`. The other tests in this file already use `[0][0]`. Test-only change; the MambaManager logic is unaffected and its assertions (null_block at index 0, cached block 11 at index 1) pass once the correct list is selected.
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Testing