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 84.70588% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.97%. Comparing base (c5bb0c1) to head (67753df).

Files with missing lines	Patch %	Lines
...vices/package-manager/PnpmPackageManagerAdapter.ts	75.00%	11 Missing ⚠️
packages/core/src/tests/workspace-root.ts	86.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1629      +/-   ##
==========================================
- Coverage   88.41%   87.97%   -0.44%     
==========================================
  Files          37       36       -1     
  Lines        1027     1073      +46     
  Branches      193      202       +9     
==========================================
+ Hits          908      944      +36     
- Misses        118      128      +10     
  Partials        1        1              

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