Allow templating for `requires[].git.repo`

### Expected behavior
Templating should work for `requires[].git.repo`. This field doesn't seem to support templating, as outlined in the docs: https://skaffold.dev/docs/environment/templating/. This is required to access a remote private git repository from a CI pipeline.

### Actual behavior
Templating does not work for `requires[].git.repo`

### Information

- Skaffold version: v2.4.0
- Operating system: Ubuntu 22.04.1
- Installed via: Standalone binary
- Contents of skaffold.yaml:

```yaml
---
apiVersion: skaffold/v4beta4
kind: Config
metadata:
name: my-config

requires:
- configs:
- my-remote-config
git:
repo: "https://{{.PAT}}@dev.azure.com/my-org/my-project/_git/my-remote-repo"
path: skaffold.yaml
sync: true
ref: develop
```

### Steps to reproduce the behavior

1. Store a skaffold config in a remote repository
2. Run `skaffold run -m kafka` while passing in a PAT env var for your repo
3. See that skaffold is not able to resolve the templated value