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Add `hyperfine` installation instructions; update `hyperfine` code samples (#13034) 

## 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:**
```shell
$ ./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.
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CONTRIBUTING.md
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@ -397,12 +397,18 @@ which makes it a good target for benchmarking.
git clone --branch 3.10 https://github.com/python/cpython.git crates/ruff_linter/resources/test/cpython
```
Install `hyperfine`:
```shell
cargo install hyperfine
```
To benchmark the release build:
```shell
cargo build --release && hyperfine --warmup 10 \
"./target/release/ruff ./crates/ruff_linter/resources/test/cpython/ --no-cache -e" \
"./target/release/ruff ./crates/ruff_linter/resources/test/cpython/ -e"
"./target/release/ruff check ./crates/ruff_linter/resources/test/cpython/ --no-cache -e" \
"./target/release/ruff check ./crates/ruff_linter/resources/test/cpython/ -e"
Benchmark 1: ./target/release/ruff ./crates/ruff_linter/resources/test/cpython/ --no-cache
Time (mean ± σ): 293.8 ms ± 3.2 ms [User: 2384.6 ms, System: 90.3 ms]
@ -421,7 +427,7 @@ To benchmark against the ecosystem's existing tools:
```shell
hyperfine --ignore-failure --warmup 5 \
"./target/release/ruff ./crates/ruff_linter/resources/test/cpython/ --no-cache" \
"./target/release/ruff check ./crates/ruff_linter/resources/test/cpython/ --no-cache" \
"pyflakes crates/ruff_linter/resources/test/cpython" \
"autoflake --recursive --expand-star-imports --remove-all-unused-imports --remove-unused-variables --remove-duplicate-keys resources/test/cpython" \
"pycodestyle crates/ruff_linter/resources/test/cpython" \
@ -467,7 +473,7 @@ To benchmark a subset of rules, e.g. `LineTooLong` and `DocLineTooLong`:
```shell
cargo build --release && hyperfine --warmup 10 \
"./target/release/ruff ./crates/ruff_linter/resources/test/cpython/ --no-cache -e --select W505,E501"
"./target/release/ruff check ./crates/ruff_linter/resources/test/cpython/ --no-cache -e --select W505,E501"
```
You can run `poetry install` from `./scripts/benchmarks` to create a working environment for the