Add hyperfine installation instructions; update hyperfine code samples

[olp-cs]

Summary

When following the step-by-step instructions to run the benchmarks in CONTRIBUTING.md, I encountered two errors:

Error 1:
bash: hyperfine: command not found

Solution: I updated the instructions to include the step of installing the benchmark tool.

Error 2:

$ ./target/release/ruff ./crates/ruff_linter/resources/test/cpython/ 
error: `ruff <path>` has been removed. Use `ruff check <path>` instead.

Solution: I added check.

Test Plan

I tested it by running the benchmark-related commands in a new workspace within GitHub Codespaces.

[charliermarsh]

I'm a little mixed on adding hyperfine to the dev container since most contributors won't need to run benchmarks, but not strongly opposed at all.

[olp-cs]

most contributors won't need to run benchmarks

I agree, that makes sense! I will revert this change.

[codspeed-hq]

CodSpeed Performance Report

Merging #13034 will degrade performances by 7.41%

_{Comparing olp-cs:hyperfine (c2f0d1f) with main (ecd9e6a)}

Summary

❌ 1 regressions
✅ 31 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	olp-cs:hyperfine	Change
❌	linter/default-rules[numpy/globals.py]	170.5 µs	184.2 µs	-7.41%