CONTRIBUTING.md needs some tweaks

[stephentoub]

For the .NET client:

• You don't need just
• You need typescript and tpx
• You need to run npm install in the ./nodejs and ./test/harness directories

[github-actions]

Thank you @stephentoub for reporting this! I've labeled this as documentation and sdk/dotnet since it relates to improving the .NET setup instructions in CONTRIBUTING.md.

The points you've raised are clear and actionable:

• Clarify that just is not required for .NET development
• Document the need for TypeScript and tpx
• Add instructions to run npm install in the ./nodejs and ./test/harness directories

A maintainer will review and update the documentation accordingly.

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