Update Daft results for v0.7.4

[desmondcheongzx]

Update Daft (Parquet, single) benchmark results and scripts for Daft v0.7.4 on c6a.4xlarge.

Change the benchmark script to reflect updated Daft capabilities:

• 43/43 queries now pass. Previously Q19, Q36, Q43 were null.
• Remove all Python API workarounds. Every query now runs as pure SQL.
• Add proper OFFSET support (previously emulated with inflated LIMIT + post-hoc slicing).

Benchmarked on c6a.4xlarge with 500 GB gp2 disk.

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