EngSys: Avoid Set-Location

[danieljurek]

It's not idiomatic Rust to be setting location on behalf of the caller. Many calls to Set-Location and Push-Location are likely not necessary to engsys and may not impact local engsys dev work if removed.

Set-Location usage: https://github.com/search?q=repo%3AAzure%2Fazure-sdk-for-rust+Set-Location+path%3A**%2F*.ps1+-path%3Aeng%2Fcommon&type=code

Push-Location usage: https://github.com/search?q=repo%3AAzure%2Fazure-sdk-for-rust+Push-Location+path%3A**%2F*.ps1+-path%3Aeng%2Fcommon&type=code