Add specific message during `test-proxy push`

This is what the output looks like when there is no work to be done:

```
C:/repo/azure-sdk-for-python [test-storage-tag-combination]|>test-proxy push -a sdk/storage/azure-storage-blob/assets.json
Running proxy version is Azure.Sdk.Tools.TestProxy 20231013.1
git --version
git remote -v
git remote set-url origin https://github.com/Azure/azure-sdk-assets-integration
git status --porcelain
git remote -v
git remote set-url origin https://github.com/Azure/azure-sdk-assets-integration
```

Not very understandable!