feat: add support for pnpm

[neilime]

No description provided.

[neilime]

@copilot finialize the work: fix build make tests passing

[Copilot]

@neilime I've opened a new pull request, #1659, to work on those changes. Once the pull request is ready, I'll request review from you.

[neilime]

@copilot migrate this repo to use pnpm instead of npm

[Copilot]

@neilime I've opened a new pull request, #1660, to work on those changes. Once the pull request is ready, I'll request review from you.

[codecov]

Codecov Report

❌ Patch coverage is 84.61538% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.97%. Comparing base (3736376) to head (e22c9cf).

Files with missing lines	Patch %	Lines
...ackages/core/src/services/PackageManagerService.ts	84.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1629      +/-   ##
==========================================
+ Coverage   89.03%   89.97%   +0.93%     
==========================================
  Files          31       28       -3     
  Lines         757      768      +11     
  Branches      132      142      +10     
==========================================
+ Hits          674      691      +17     
+ Misses         83       77       -6     

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