[Data] Fix read_parquet_benchmark_single_node by update parallelism -> override_num_blocks

[scottjlee]

Why are these changes needed?

Continuation of #43692, update release test code with remaining needed changes for replacing parallelism parameter with override_num_blocks.

Related issue number

Closes #43745

Checks

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• I've included any doc changes needed for https://docs.ray.io/en/master/.
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• I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/
• Testing Strategy
  • Unit tests
  • Release tests https://buildkite.com/ray-project/release/builds/10649
  • This PR is not tested :(

[scottjlee]

need to remove the materialize, since the benchmark function run_materialize_ds runs the timer when materializing.

[c21]

thanks!