feat(benchmark): allow overriding lockfile

[KSXGitHub]

Make it easier to benchmark different lockfiles without having to modify the fixture content.

[github-actions[bot]]

Micro-Benchmark Results

Linux

group                          main                                   pr
-----                          ----                                   --
tarball/download_dependency    1.00      8.1±0.11ms   533.7 KB/sec    1.02      8.3±0.63ms   525.5 KB/sec

[github-actions[bot]]

Integrated-Benchmark Report (Linux)

Scenario: Frozen Lockfile

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
pacquet@HEAD	142.9 ± 10.1	126.6	164.4	1.04 ± 0.10
pacquet@main	137.8 ± 8.4	125.7	158.9	1.00

BENCHMARK_REPORT.json

```json { "results": [ { "command": "pacquet@HEAD", "mean": 0.1428908758685714, "stddev": 0.010082594067539467, "median": 0.14413127744, "user": 0.06734682285714286, "system": 0.20059271714285712, "min": 0.12661095794000002, "max": 0.16437400394, "times": [ 0.15518144894000002, 0.14637185494000002, 0.13644853994, 0.14869871194, 0.14517859794000001, 0.13212219294000002, 0.12661095794000002, 0.14667448394000002, 0.16437400394, 0.13724930294, 0.14933162494000002, 0.13673736394000002, 0.14308395694, 0.13240922094000002 ], "exit_codes": [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ] }, { "command": "pacquet@main", "mean": 0.13781609267333336, "stddev": 0.008377426861409534, "median": 0.13791584494, "user": 0.05628367999999999, "system": 0.21385735999999997, "min": 0.12565650594000002, "max": 0.15892093394, "times": [ 0.13098355894000002, 0.13724597494000002, 0.12919311894000002, 0.14439213894000003, 0.13307198594000003, 0.13869599894, 0.12775115894000003, 0.14416606494, 0.13843282794, 0.13503398494000002, 0.13791584494, 0.14313661794000002, 0.12565650594000002, 0.14264467394000002, 0.15892093394 ], "exit_codes": [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ] } ] } ```

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (6b00165) 87.11% compared to head (3d7392f) 87.11%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #196 +/- ## ======================================= Coverage 87.11% 87.11% ======================================= Files 56 56 Lines 2824 2825 +1 ======================================= + Hits 2460 2461 +1 Misses 364 364 ``` | [Files](https://app.codecov.io/gh/pnpm/pacquet/pull/196?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pnpm) | Coverage Δ | | |---|---|---| | [crates/testing-utils/src/fs.rs](https://app.codecov.io/gh/pnpm/pacquet/pull/196?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pnpm#diff-Y3JhdGVzL3Rlc3RpbmctdXRpbHMvc3JjL2ZzLnJz) | `100.00% <100.00%> (ø)` | |

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[zkochan]

I don't understand what this change is about and why it is needed.

[KSXGitHub]

I don't understand what this change is about and why it is needed.

Before this PR, if I want to benchmark a different lockfile, I would have to copy the lockfile and paste it to the lockfile fixture. After this PR, I'll simply specify the directory containing the lockfile.

[KSXGitHub]

Also, please ignore the snapshot changes. They are from https://github.com/pnpm/pacquet/pull/197 as I need the test to pass.