[UT][PCP&DCP] UT for block_table.py

[pisceskkk]

Purpose

This PR add unit test for compute_slot_mapping function in block_table.py with various pcp_size & dcp_size & cp_kv_cache_interleave_size.

Test Plan

pytest tests/v1/worker/test_block_table.py

Test Result

==== 17 passed, 1 warning in 2.65s ====

CC @LucasWilkinson @zhangsicheng5 @FENP

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[gemini-code-assist]

Code Review

This pull request adds comprehensive unit tests for the compute_slot_mapping function in block_table.py. The tests cover various configurations of PCP, DCP, and KV cache interleave sizes, which is great for ensuring correctness under different parallelism settings. My review focuses on improving the clarity and correctness of the test documentation to prevent future confusion.

[mergify]

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