Build: Use --follow-symlinks in VSCE

[JustinGrote]

Prerequisites

• [x] I have written a descriptive issue title.
• [x] I have searched all issues to ensure it has not already been reported.

Summary

vsce as of October now (finally) supports symlink following, so our build scripts can stop the dumb task of copying PSES to vscode for a build.

https://github.com/microsoft/vscode-vsce/commit/51e122af452144b12c5231a2615a81404fda32a1

Proposed Design

No response

[SydneyhSmith]

@andyleejordan says go for it 😄

[JustinGrote]

Thanks @andyleejordan!

[andyleejordan]

I still need to fix Copilot, it failed to iterate on my review.