refactor: reuse registry-mock in benchmark

[KSXGitHub]

No description provided.

[github-actions]

Micro-Benchmark Results

Linux

group                          main                                   pr
-----                          ----                                   --
tarball/download_dependency    1.00      6.6±0.27ms   654.7 KB/sec    1.01      6.7±0.18ms   648.0 KB/sec

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f802fdf) 87.01% compared to head (90a8659) 87.01%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #201   +/-   ##
=======================================
  Coverage   87.01%   87.01%           
=======================================
  Files          56       56           
  Lines        2827     2827           
=======================================
  Hits         2460     2460           
  Misses        367      367           

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[github-actions]

Integrated-Benchmark Report (Linux)

Scenario: Frozen Lockfile

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
pacquet@HEAD	147.3 ± 12.4	127.6	164.8	1.08 ± 0.12
pacquet@main	136.3 ± 10.8	121.7	162.7	1.00

BENCHMARK_REPORT.json

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