I created a repository (without link to git) for Google Dataform and a workspace.
I initialized a first setup and pushed those first files.
Where can I see the repo and all the commits I do in there? Looked in Cloud Storage, Artifact Registry, Cloud Source Repositories but can't find it.

The repositories are listed here, please see the official documentation for more context.
You may also explore the possibility of connecting to a remote repository, as the Dataform repository doesn't meet your requirement for viewing commits.