Improve speed of benchmark verification tests

**Is your feature request related to a problem or challenge? Please describe what you are trying to do.**
PR https://github.com/apache/arrow-datafusion/pull/4015 added a new CI workflow to verify that the benchmark queries produce the correct results. This prevents regressions so is important, but it takes a long time to run.

**Describe the solution you'd like**
I think the ideal solution would be to just run on more powerful hardware. I would also like be able to be able to run the benchmarks in CI against larger datasets. I would be willing to provide self-hosted hardware if there is a simple and secure way of doing this. I am looking into some ideas.

**Describe alternatives you've considered**
None

**Additional context**
None

The relevant entry point is the benchmark-verification CI workflow introduced by PR #4015; start there and identify which benchmark steps dominate runtime. Compare faster runners with larger datasets and assess a secure self-hosted option; done means CI still verifies correct results while meeting the agreed runtime and dataset goals.

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