[cherry-pick] [OSS Tool] OSS License Fix: add copyright for @github/copilot-linuxmusl packages

[vs-code-engineering]

Cherry-pick of #318470 from release/1.122.

OSS License Fixes

Triggered by @anthonykim1 · Fixes license errors from OSS tool run: https://github.com/microsoft/vscode-engineering/actions/runs/26482120781

Changes

Package	Fix Type	License	Source	Notes
@github/copilot-linuxmusl-arm64	prependLicenseText	Custom (GitHub Copilot CLI License)	LICENSE.md	LICENSE.md has no copyright statement; attributed to GitHub, Inc. (org owner)
@github/copilot-linuxmusl-x64	prependLicenseText	Custom (GitHub Copilot CLI License)	LICENSE.md	LICENSE.md has no copyright statement; attributed to GitHub, Inc. (org owner)

⚠️ Packages requiring manual resolution

Package	Reason
@microsoft/mxc-sdk@0.2.0	No repository URL in npm package; microsoft/mxc-sdk returns 404 on GitHub — repository could not be resolved
@vscode/diff@0.0.2-0	Repository microsoft/vscode-packages returns 404 on GitHub — repository is private or does not exist

⚠️ The licenses for the packages listed above could not be resolved automatically and must be manually added or reviewed before this PR is merged. A human reviewer must inspect each package and either add an entry to ./vscode/cglicenses.json (using fullLicenseTextUri, fullLicenseText, or prependLicenseText) or confirm the listed reason is acceptable.

Next steps

After merging this PR, run the OSS tool workflow to regenerate ThirdPartyNotices.txt with the updated license data.

Generated by OSS Tool License Fixer · ● 6M · ◷

/cc @federicobrancasi @benvillalobos @dileepyavan

[Copilot]

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