[rush] Regression: folderToCopy creates subfolder in deploy folder

[nlochschmidt]

Summary

In rush version 5.107.4 the folderToCopy option in deploy.json works as documented and places the files in the referenced folder top-level into common/deploy. From version 5.108.0 onwards however a subfolder gets created in common/deploy.

Repro steps

1. Create a deploy.json with a folderToCopy pointing to a folder with some files
2. Run rush deploy --overwrite in version 5.107.4 and check common/deploy to see the files top-level
3. Switch to any version from 5.108.0 to 5.112.1
4. Run rush deploy --overwrite again and check common/deploy to see the files now inside of a folder with the name of the source folder

Standard questions

Question	Answer
@microsoft/rush globally installed version?	5.112.1
rushVersion from rush.json?	5.112.1
useWorkspaces from rush.json?	true
Operating system?	Mac
Would you consider contributing a PR?	Yes
Node.js version (node -v)?	18.18.4

[nlochschmidt]

Possibly related to #4373

[iclanton]

Fixed in Rush 5.112.2.