v2 ci: speed up some of powershell's processes (#2818)

* v2: speed up some of powershell's processes

* v2-ci: downloading latest Go on Windows isn't slow anymore, so update the log message accordingly

* v2: CI: use 7z on Windows instead of Expand-Archive
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f