docs(CONTRIBUTING): replace 'npm run test' and 'npx nx' command with 'pnpm' equivalents

[Antoliny0919]

🎯 Changes

The project currently uses pnpm as its package manager. While using npm isn't an issue, I think it would be more consistent to update the contribution guide to use pnpm throughout as well.

✅ Checklist

• I have followed the steps in the Contributing guide.
• I have tested this code locally with pnpm run test:pr.

🚀 Release Impact

• This change affects published code, and I have generated a changeset.
• This change is docs/CI/dev-only (no release).

Summary by CodeRabbit

• Documentation
  • Updated testing instructions to use pnpm commands.
  • Revised guidance for running all tests and tests for individual packages.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 30e65708-8d2d-4a8b-b91c-9578b8dd47cf

📥 Commits

Reviewing files that changed from the base of the PR and between 86bb8a6 and 4b9cd05.

📒 Files selected for processing (1)

• CONTRIBUTING.md

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📝 Walkthrough

Walkthrough

Updated CONTRIBUTING.md to use pnpm for running all tests and package-specific library tests.

Changes

Test command documentation

Layer / File(s)	Summary
Update test command instructions CONTRIBUTING.md	The contributor guide now uses pnpm run test and pnpm nx run ...:test:lib commands.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• TanStack/query#11066: Updates overlapping CONTRIBUTING.md guidance for running commands with pnpm.

Suggested reviewers: kobihikri

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly matches the PR’s main change: switching CONTRIBUTING.md commands to pnpm equivalents.
Description check	✅ Passed	The description follows the template and includes the changes, checklist, and release impact sections.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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