test(lib): use registry-mock

[KSXGitHub]

I forgot that the workspace member package-manager also has a test that relies on the registry.

[github-actions]

Micro-Benchmark Results

Linux

group                          main                                   pr
-----                          ----                                   --
tarball/download_dependency    1.00      6.7±0.36ms   649.7 KB/sec    1.00      6.7±0.22ms   648.8 KB/sec

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (bd7002a) 87.01% compared to head (e7d5f79) 87.05%.
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #205      +/-   ##
==========================================
+ Coverage   87.01%   87.05%   +0.03%     
==========================================
  Files          56       56              
  Lines        2827     2828       +1     
==========================================
+ Hits         2460     2462       +2     
+ Misses        367      366       -1     

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[github-actions]

Integrated-Benchmark Report (Linux)

Scenario: Frozen Lockfile

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
pacquet@HEAD	144.2 ± 11.2	128.2	163.4	1.05 ± 0.11
pacquet@main	137.6 ± 10.1	125.5	155.6	1.00

BENCHMARK_REPORT.json

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