get_vcs starts searching git folder from tmp dir instead of project (#1946) (#1947)

* fix (builder): take `self._original_path` if available to find `.git` folder

* change (vcs): use `git rev-parse --show-toplevel` to find git root folder

* fix (vcs): change back to original working dir after finding vcs

* change (builder): introduce self._original_path to keep original path
if(vcs): resolve directory for `get_vcs`