feat(benchmark): allow overriding lockfile

[KSXGitHub]

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

[github-actions]

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]

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

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      "user": 0.05628367999999999,
      "system": 0.21385735999999997,
      "min": 0.12565650594000002,
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}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #196   +/-   ##
=======================================
  Coverage   87.11%   87.11%           
=======================================
  Files          56       56           
  Lines        2824     2825    +1     
=======================================
+ Hits         2460     2461    +1     
  Misses        364      364           

Files	Coverage Δ
crates/testing-utils/src/fs.rs	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 #197 as I need the test to pass.