Remove bundled @github/copilot from release tarball

[pilgd-aws]

Problem

The CE 1.2.0-rc.1 tarball includes @github/copilot* packages in node_modules/ which add 237 MB to the release artifact:

152M  node_modules/@github/copilot-linuxmusl-x64/
82M   node_modules/@github/copilot/
3.0M  node_modules/@github/copilot-sdk/

This was introduced by VS Code 1.119.x's built-in Copilot integration (ref: https://code.visualstudio.com/updates/v1_116).

Since SageMaker Code Editor removes all Copilot-related features for compliance/branding/legal reasons, these dependencies should also be excluded from the tarball.

Impact

• Conda package size increased from ~50 MB (CE 1.0.13) to ~150 MB (CE 1.2.0-rc.1)
• The @github/copilot* packages account for nearly all of the increase
• Unnecessary binary bloat shipped to every SMD customer

Proposed Fix

Exclude @github/copilot* from node_modules/ in the tarball creation script (scripts/create_code_editor_tarball.sh or equivalent).

rm -rf vscode-reh-web-linux-x64/node_modules/@github

Workaround

The conda-forge feedstock can strip it during packaging in build.sh as an interim fix.